what mass of na2so4 is needed to prepare 350. ml of a solution having a sodium ion concentration of 0.125 m? 24.98 12.4g 8.88 g 03.11g 6.218
Answers
The mass of Na2SO4 that is needed to prepare a 350 ml solution having a sodium ion concentration of 0.125 M is 6.218 g.
Given: Volume of the solution = 350 mL = 0.350 LConcentration of sodium ion = 0.125 mWe have to find the mass of Na2SO4 required to prepare this solution.Let the mass of Na2SO4 be ‘m’.The molar mass of Na2SO4 = 142.04 g/molNumber of moles of sodium ions in the solution = 0.125 mMolarity = (Number of moles of solute) / (Volume of solution in liters)0.125 = (2 × number of moles of Na ions) / 0.350Lnumber of moles of Na ions = 0.125 × 0.350 / 2 = 0.021875 molSince 1 mol of Na2SO4 contains 2 moles of Na ions.
Number of moles of Na2SO4 = 0.021875 / 2 = 0.010938 molmass of Na2SO4 required = Number of moles of Na2SO4 × Molar mass of Na2SO4= 0.010938 × 142.04= 1.551 g ≈ 6.218 gSo, the mass of Na2SO4 that is needed to prepare a 350 ml solution having a sodium ion concentration of 0.125 M is 6.218 g.
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Related Questions
a 30.00-ml sample of 0.125 m hcooh is being titrated with 0.175 m naoh. what is the ph after 30.0 ml of naoh has been added? ka of hcooh
Answers
The pH after 30.0 ml of NaOH has been added is 2.18.
To find the pH after 30.0 ml of 0.175 M NaOH has been added to a 30.00 ml sample of 0.125 M HCOOH, you need to use the balanced chemical equation for the reaction between HCOOH and NaOH:
HCOOH + NaOH → NaCOOH + H2O
This equation shows that 1 mole of HCOOH reacts with 1 mole of NaOH, so the number of moles of NaOH added to the HCOOH solution is:
n(NaOH) = C(NaOH) x V(NaOH) = 0.175 mol/L x 0.0300 L = 0.00525 mol
Since the stoichiometry of the reaction is 1:1, this means that 0.00525 mol of HCOOH has been neutralized by the NaOH. The remaining amount of HCOOH is:
n(HCOOH) = C(HCOOH) x V(HCOOH) - n(NaOH) = 0.125 mol/L x 0.0300 L - 0.00525 mol = 0.00225 mol
Now you can use the Ka expression for HCOOH to find the concentration of H+ ions:
Ka = [H+][COO-]/[HCOOH] = 1.8 x 10^-4
[H+][0.00225]/[0.1225 - 0.00525] = 1.8 x 10^-4
[H+] = 0.00659 M
pH = -log[H+] = 2.18
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The amount of water leaking from a water tank can be modeled with the function f(x) = −x3 − 10x2 − x 120, where x measures the number of minutes since the leak began and f(x) measures the volume of the tank. during what time period is there water in the tank? (−[infinity], −8) ∪ (−5, 3) (−[infinity], −8] ∪ [−5, 3] (0, 3) (0, 3]
Answers
The time period during which there is water in the tank can be described as (-∞, -8) ∪ (-5, 3). This means that there is water in the tank before 8 minutes have passed since the leak began and between 5 and 3 minutes before the present time.
The given function f(x) = -x^3 - 10x^2 - x + 120 represents the volume of water in the tank at a given time x (measured in minutes since the leak began). To determine the time period during which there is water in the tank, we need to find the values of x for which f(x) is greater than zero.
By analyzing the function and its graph, we can observe that f(x) is positive for values of x in the intervals (-∞, -8) and (-5, 3). This means that before 8 minutes have passed since the leak began and between 5 and 3 minutes before the present time, the volume of the tank is positive, indicating that there is water in the tank during those time periods.
Therefore, the time period during which there is water in the tank is (-∞, -8) ∪ (-5, 3).
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if 193 ml of chlorine gas was collected at 21 celsius, what volume would it have if the temperature dropped to 0 celsius
Answers
Answer:
New volume of chlorine gas (V2) = 179 ml (Approx)
Explanation:
Given:
Volume of chlorine gas (V1) = 193 ml
Temperature of chlorine gas (T1) = 21°C = 21 + 273 = 294 k
New temperature of chlorine gas (T2) = 0°C = 0 + 273 = 273 k
Find:
New volume of chlorine gas (V2) = ?
Computation:
Using charle's law
V1 / T1 = V2 / T2
193 / 294 = V2 / 273
V2 = 179.21
New volume of chlorine gas (V2) = 179 ml (Approx)
Why is Bohr diagram better than orbital diagram ?
Answers
Answer:
hfjdjdjdjdjdjdjd
Explanation:
rjeiejejejeje
Community funding may suffer when a company receive a _________ which may mean less money to pay for public service
Answers
Answer:
Public substance abuse treatment programs have traditionally relied on three funding Such an agency may already have funding to provide services to individuals However, no such restrictions apply to payments received through manage.
What’s the answer??????
Answers
Answer:
D. Two non-metals
Explanation:
Non metals mostly form covalent bonds where they share electrons whereas, metal and nonmetal form ionic bonds where electrons are transferred.
6. What must be done to observe the chemical properties of a substance?
O Change it into a different substance.
Be able to describe its hardness or luster.
Watch it melt from a solid into a liquid.
Change its shape into a different shape.
Answers
The statement that explains what must be done the observe the chemical property of a substance is as follows: Change it into a different substance (option A)
What is a chemical property of a substance?The chemical property of a substance is any of a material's properties that only becomes evident during a chemical reaction.
Chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.
This suggests that chemical properties cannot be observed via change of state or phase but can only be observed when the substance changes into a different substance i.e. undergo a chemical reaction.
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What is 0.00034 in exponential form
Answers
Answer:
3.4 × 10 ^− 4
Explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the
10 . If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
Which of these describes how traits are shown on a branching tree diagram?
A. All the traits developed at the same time.
B. The traits developed in organisms in random order.
C. Traits lower on the tree developed before traits higher on the tree.
D.Traits higher on the tree developed before traits lower on the tree.
Answers
Answer:
D- Traits higher on the tree developed before traits lower on the tree.
Explanation:
The answer is D because the higher/stronger a trait is it will be developed before any lower traits.
How many grams of NaOH are there in 700.0 mL of a 0.18 M NaOH solution? *
a. 3.5 g
b. 2.19 x 10^-3 g
c. 149
d. 1149
e. 5.049
Answers
Answer:
E. 5.049
Explanation:
Multiply the concentration by volume (in liters) first to get moles of NaOH. Then multiply by the molar mass of NaOH to convert to grams.
0.18 M • 0.7000 L = 0.126 mol NaOH
0.126 mol • 39.997 g/mol = 5.040 g --> The closest answer seems to be e. 5.049 g
A reaction which is unfavorable with respect to entropy, but favorable with respect to enthalpy a could occur at low temperatures but not at higher temperatures. b could not occur regardless of temperature. c could occur at any temperature. d could occur at high temperatures but not at lower temperatures, e none of the above
Answers
The correct answer is: a) The reaction could occur at low temperatures but not at higher temperatures.
When a reaction is unfavorable with respect to entropy but favorable with respect to enthalpy, it means that the reaction has a negative change in entropy (ΔS) but a negative change in enthalpy (ΔH). In such cases, temperature plays a crucial role in determining the spontaneity of the reaction.
At low temperatures, the unfavorable entropy change can be overcome by the favorable enthalpy change, resulting in a negative Gibbs free energy change (ΔG = ΔH - TΔS). Since ΔG determines the spontaneity of a reaction, the reaction can occur at low temperatures where the enthalpy change dominates over the entropy change.
However, as the temperature increases, the entropy term (TΔS) in the Gibbs free energy equation becomes more significant. If the entropy change is strongly unfavorable, the positive entropy term can outweigh the negative enthalpy term, resulting in a positive ΔG and making the reaction non-spontaneous at higher temperatures.
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Which type of compound can be made in one step from a secondary alcohol?
A. an aldehyde
B. an alkane
C. a carboxylic acid
D. a ketone
Answers
The type of compound that can be made in one step from a secondary alcohol is a ketone. This is because the process of oxidizing a secondary alcohol results in the formation of a ketone.
Oxidation is a chemical reaction that involves the loss of electrons, and in the case of secondary alcohols, the loss of two electrons from the hydroxyl group (OH) results in the formation of a carbonyl group (C=O) that characterizes ketones.The reaction can be carried out by using various oxidizing agents such as chromic acid, potassium permanganate, or sodium dichromate. The choice of the oxidizing agent depends on the specific secondary alcohol being used and the desired end product. However, it is important to note that the reaction conditions need to be carefully controlled to avoid over-oxidation, which can lead to the formation of a carboxylic acid.In conclusion, a ketone can be made in one step from a secondary alcohol through oxidation. This process is commonly used in organic synthesis to create various compounds that have different applications in industries such as pharmaceuticals, perfumes, and flavors.Hi! The compound that can be made in one step from a secondary alcohol is D. a ketone. When a secondary alcohol undergoes oxidation, it is converted into a ketone.
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Complete the following table, which deals with pH, [H ], acidity, neutrality and basicity. pH H- 1.0 x 104 solution is: neutra Remember Acid always donate Hydrogen ions and Base Accepts it and if they can do both they are amphiprotic
Answers
the table that follows,7 covers pH, [H], acidity, neutrality, and basicity. Solution with pH -1.0 x 10⁴ is: neutral Always keep in mind that Acid always donates Hydrogen ions and Base always accepts them.
If pH = log[H⁺]
So [H⁺]=10⁻¹¹
the solution is basic because pH>7
If [H⁺]=10⁻⁴=pH=-log[H⁺]=4 solution is acidic
If solution neutral [H⁺]=[OH⁻]=10⁻⁷ and pH=7
Neutrality refers to the state of being neutral, impartial, or unbiased in a given situation or conflict. In international relations, neutrality refers to the policy of a state or nation to remain neutral and not take sides in armed conflicts between other countries. In chemistry, neutrality refers to the state of a substance or solution that is neither acidic nor basic, with a pH value of 7. This state is often referred to as "neutral pH." In social situations, neutrality can refer to the act of not taking sides or expressing opinions in a debate or disagreement, in order to maintain a neutral stance and not offend any parties involved.
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Witch element has the smallest radius
Answers
Answer: Helium has the smallest radius.
Explanation: Helium has the smallest atomic radius. Due to nuclear charges and stuff ect-
Does the metals determine how high or low voltage is in fruit battery?
Or is it the pH level in fruits that determines voltage? also can you give a source to this.
Answers
Answer: 1.788 volts.
Explanation:
To solve this problem we can combine battery cells to create higher voltages. Building more lemon batteries and connecting them with a metal wire from "+" to "-" adds the voltage from each cell. The two lemon batteries above, combine to produce a voltage of 1.788 volts.
In an endothermic reaction...
Heat energy goes into the reaction and there is a decrease in the potential energy of the products.
Heat energy goes into the reaction and there is an increase in potential energy of the products.
Heat energy is a product of the reaction and there is a decrease in the potential energy of the products.
Heat energy is a product of the reaction and there is an increase in the potential energy of the products.
Answers
Answer:
to hard im only in year 8
Explanation:
Answer:
I am pretty sure it is A. Heat energy goes into the reaction and there is a decrease in the potential energy of the products.
Explanation:
If not then sorry I tried my best to help out. Good Luck.
Describe how the charges of the subatomic particles interact with one another.
Answers
Answer:
Electrons, Protons, and Neutrons. ... Protons are another type of subatomic particle found in atoms. They have a positive charge so they are attracted to negative objects and repelled from positive objects. Again, this means that protons repel each other
thiobacillus oxidizes inorganic sulfur compounds and reduces co2. this bacterium is a
Answers
Thiobacillus is a chemolithotrophic bacterium that oxidizes inorganic sulfur compounds and reduces CO2 during its metabolic activities.
Thiobacillus is a type of bacterium that possesses a unique metabolic capability called chemolithotrophy. Chemolithotrophs derive their energy by oxidizing inorganic compounds instead of relying on organic matter. Thiobacillus specifically specializes in oxidizing inorganic sulfur compounds, such as hydrogen sulfide (H2S) and elemental sulfur (S). This process, known as sulfur oxidation, provides the bacterium with energy.
In addition to sulfur oxidation, Thiobacillus also carries out the reduction of carbon dioxide (CO2) as part of its metabolic activities. By utilizing the energy obtained from sulfur oxidation, Thiobacillus can reduce CO2 and convert it into organic compounds through a process called carbon fixation.
The ability of Thiobacillus to perform sulfur oxidation and CO2 reduction makes it an important contributor to sulfur and carbon cycling in various environments, including sulfur-rich ecosystems such as acidic mine drainage and geothermal areas.
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he long run equilibrium condition for perfect competition is:
a. P=AVC=MR=MC.
b. Q=AVC=MR=MC.
c. Q=ATC=MR=MC.
d. P=ATC=MR=MC.
Answers
Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).
Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.
In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.
Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
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Apply The axes in the coordinate grid at the right represent the walls of a bedroom. One corner of the room is at the origin. What is the distance from that corner of the room to the corner of the bed that is farthest away? if necessary, round to the nearest tenth of a foot.
SHOW WORK
Answers
The axes in the coordinate grid on the right represent the walls of a room. the distance from that corner of the room to the corner of the furthest bed is 11 axes. A coordinate grid has two perpendicular lines, or axes (pronounced AX-eez), labeled just like number lines. The horizontal axis is usually called the x-axis. The vertical axis is usually called the y-axis. The point where the x- and y-axis intersect is called the origin.
How many axes are in a coordinate system?The coordinate plane has two axes: the horizontal and vertical axes. These two axes intersect one another at a point called the origin.
What are the XY and Z axes?The x axis is in the plane of the screen and is positive toward the right and negative toward the left. The y axis is in the plane of the screen and is positive toward the top and negative toward the bottom. The z axis is perpendicular to the screen or keyboard, and is positive extending outward from the screen.
With this information, we can conclude that the distance from that corner of the room to the corner of the furthest bed is 11 axes.
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While shopping in an open market,you notice a stand with some nice bananas.you ask the proprietor the price of bananas,wich look like about 1 quart.he quotes you 2 gulag as the price.you know that in us you can typically by a quart of bananas fpr $0.50
Answers
The price quoted by the proprietor for 1 quart of bananas (approximately 1⁴) is 2 gulag (2₀). In the US, a quart of bananas typically costs $0.50.
The given information states that the quantity of bananas is about 1 quart, which can be represented as 1⁴ (1 raised to the power of 4). The price quoted by the proprietor is 2 gulag, denoted as 2₀ (2 with a subscript of 0). Comparatively, in the US, the price for a quart of bananas is $0.50.
The question highlights a discrepancy between the quoted price and the typical price in the US. By providing the context of prices and quantities using appropriate subscripts and superscripts, the question emphasizes the difference between the two scenarios.
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6 Which element requires the least amount of
energy to remove the most loosely held electron
from a gaseous atom in the ground state?
(1) Na
(3) P
(2) Ar
(4) Ci
Answers
Answer: 1) Na because it requires least amount of energy.
Na requires the least amount of energy to remove the most loosely held electron.
Why does Na have the least ionization enthalpy among the given elements?Electronic configuration of the elements:Na - [Ne] 3s¹
P - [Ne] 3s² 3p³
Ar - [Ne] 3s² 3p⁶
Cl - [Ne] 3s² 3p⁵
As it can be seen, Na after losing one electron from its outermost subshell attains a stable noble gas configuration. So, it will require a very less amount of energy i.e., ionization enthalpy, to remove that electron.P, which already has a half-filled subshell, will not readily lose the electrons and hence requires more amount of energy.Ar has the noble gas configuration i.e., all its subshells are fully filled. A very large amount of energy will be required to remove its electron.Learn more about ionization energy here:
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Chris' yard has a light brown soil that is very fine. Chris has a hard time finding any rocks, including pebbles, in his yard. Reese's yard has a gray soil that is full of small and medium size rocks. If it rained on both of Chris' and Reese's yards, which yard would likely hold the water above ground the longest? A. Both yards would absorb the water at the same rate. B. Reese's yard C. Chris' yard D. Neither yard would absorb any water.
Answers
Answer:
B. Reese's yard
Explanation:
Because Reese's yard is full of rocks, rock's don't absorb water, while Chris' yard is only soil, which will make his yard absorb water quicker.
a solution contains 7.58 g of calcium ions in a total volume of 850 ml. calculate the concentration of calcium ions in eq/l and meq/l.
Answers
About 40% of a total blood calcium is linked to plasma proteins, predominantly albumin, with a calcium ion concentration of 0.00891765 eq/l..
What are the benefits of calcium concentration?For overall health, calcium is crucial. Calcium is utilized in some form by almost all of our body's cells. Our bodies need calcium in the neurological system, muscles, heart, and bones, among other places. In addition to supporting our bodies, our bones also store calcium.
How much calcium is there in the plasma?Adults typically have plasma calcium values of 2.5 mmol/L (or 5 mEq/L, 10 mg/dL1) or higher. Different amounts of protein-bound, complexed, or ionized calcium can be found in plasma. About 45% of a serum calcium is incorporated into plasma proteins, primarily albumin.
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What is the bond angle formed by an axial atom, the central atom, and any equatorial atom?.
Answers
The bond angle formed by an axial atom is 180 degrees and equatorial atom is 90 degrees.
Above and below the core atom are the axial atoms. These are the "pyramid points" that the molecule forms. (NOTE: Bipyramidal refers to two pyramids. The pyramids should be visible in relation to the top and bottom halves of the centre atom if you look at an image. The atoms that are located in the horizontal plane of the Centre atom are known as equatorial atoms. (Consider how close to the Earth the equator is.)
Assuming that the EX5 is made up entirely of atoms, let's continue our debate (and not lone pairs). The equatorial atoms have 120 degree binding angles with one another. The axial and equatorial atoms' bond angles are 90 degrees.
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Which is more reliable to measure accurate volume?
A) Test tube
B) Beaker
C) Measuring cylinder
D) Pipette
Answers
Answer:
Measuring cylinder
Explanation:
test tube/beaker don't usually have numbers, and a pipette is usually too small so a measuring cylinder will be the most accurate
Which has the longest bond length for the Cl-O bond?
1. ClO4-
2. ClO3-
3. ClO2-
4. ClO-
Answers
Answer:
4 ClO-
Explanation:
Bond length ∝ 1/ Bond order
Bond order of ClO − =1,
Bond order of ClO 2− =1.5,
Bond order of ClO 3− =1.66 ,
Bond order of ClO 4− =1.75.
Thus the order of bond length is
ClO 4− <ClO3− <ClO2−
<ClO −
Classify the chemical reaction: Cl₂O5 + H₂O → 2HCIO3
Answers
The reaction is an addition reaction.
What is an addition reaction?Addition reactions are chemical reactions involving 2 or more reactants reacting to produce a single product.
Addition reactions are different from decomposition reactions. In the latter, a single reactant decomposes to give two or more products.
In the illustrated reaction, Cl₂O5 and H₂O react together to form a single product, HCIO3.
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Which of the following does NOT cause a shift in a chemical equilibrium position?
a. Decreasing temperature
b. Adding more solid reactant
c. Increasing concentration
d. Decreasing volume
Answers
Answer:
d. Decreasing volume
step by step explanation:
Why did we use phenolphthalein and bromothymol blue in this experiment? What
do each of the colors indicate? What results would you expect for each of the
parts? Justify your answer using CO₂ and its effect on the indicators.
Answers
Phenolphthalein is a drab, vulnerable acid that is appreciably used as a hallmark in titration experiments to suggest the endpoint of the titration. The endpoint is indicated with the useful resource of the formation of red color on the grounds that this compound dissociates to shape crimson anions at the same time as dissolved in water.
Titration of an antacid consists of a strong acid-susceptible base titration whose pH at the endpoint is plenty much less than seven. therefore, bromophenol blue rather than phenolphthalein is used as a trademark because the pH range of bromophenol blue is a whole lot less than seven. The pH range of phenolphthalein lies above seven.
The use of CO₂ and its impact on the signs, Phenolphthalein is often used as a hallmark in acid-base titrations. Phenolphthalein is often used as an indicator in acid-base titrations. For this utility, it turns colorless in acidic answers and crimson in simple solutions. It belongs to the elegance of dyes referred to as phthalein dyes.
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