Question

1. A 19.6 gram sample of KCl is used to make a 275. mL KCl solution. What is the molarity of the KCl solution?

2. A chemist has a bottle containing 0.25 M CuCl₂. How many milliliters of this solution should the chemist use to add 12.0 grams of CuCl₂ to her reaction?

3. In a saturated solution of the ionic compound sodium sulfate, Na₃PO₄

all of the water molecules are involved in the hydration process.

some solid Na₃PO₄ is present.

all of the above

the concentration of Na⁺ is three times the concentration of PO₄^3-.

4. A solution contains 85 grams sucrose and 100. grams of water. What is the mass percent of the sucrose solution?

5. A solution contains only glycerol and fructose. There is ten times as much glycerol as fructose. Therefore,

glycerol is a solute.

both glycerol and fructose are solutes.

fructose is the solvent.

glycerol is the solvent.

6. A strong electrolyte is a solute that

dissolves in water as molecules only.

dissolves fully in water as ions only.

dissociates partially in water.

does not dissolve in water.

7. At 60^oC, NaNO₃ has a solubility of 110 grams NaNO₃ per 100 grams of water. How many grams of NaNO₃ are needed to prepare a saturated solution using 50. grams of water?

8. How many mL of 0.160 M HCl solution are needed to provide 1.50 mole of HCl?

9. To what volume would you dilute 250.0 mL of a 0.4500 M NaOH solution to obtain a 0.2700 M solution?

10. How many grams of NaNO₃ are needed to prepare a 95.00 mL solution that is 9.5% (m/v)?

11. A 140.0 mL sample of a 0.85 M H₂SO₄ solution is diluted with enough water to reduce the concentration of the solution to 0.65 M. What is the volume of the diluted H₂SO₄ solution?

12. How many milliliters of a 0.220 M NaCl solution are required in order to supply 35.0 grams of NaCl for a reaction?

13. How many liters of a 0.950 M KCl solution can be made from 65.0 grams of KCl?

14. A solution contains 0.030 mEq/L of Sn²⁺ ion. How many moles of Sn²⁺ ion are in a liter of this solution?

15. A semipermeable membrane separates a 4% starch solution and a 2% starch solution.

Initially water will flow from the 2% starch solution to the 4% starch solution.

The water level of the 2% starch solution will rise.

The 2% starch solution will be diluted.

All of these are true.

16. How many grams of solute are present in 757.0 mL of a 0.263 M H₂SO₄ solution?

17. What is the volume percent of a solution containing 15.0 mL of ethanol in 45.0 mL water assuming the volumes are additive?

18. How many equivalents are in 3.0 g of SO₄^2-?

19. How many grams of Li₂SO₄ are needed to prepare 275.0 mL of a 4.5% m/v Li₂SO₄ solution?

20. What type of mixture contains solute particles that are retained by a semipermeable membrane and that will settle out over time?

solution

colloidal

suspension

mixture

Answer 1

1 - molarity = moles of solute / volume of solution

Moles of solute = mass / molar mass

Mole of KCl = 19.6 mol./74.5 g/mol = 0.263 mole

Molarity= 0.263 mol / 0. 275 lit

Molarity=0.956 M

2 - molar mass of CuCl2 =134.5 g /mol

Mass given =12 g

Moles = 12 g / 134.5 g/mol = 0.0892 mol

Volume of solution = moles /Molarity

Volume = 0.0892 mol / 0.25 mol / lit

Volume =0.356 lit or 356 ml of CuCl2 solution

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