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Worksheet 10.1

1) At what temperature will the solubility of potassium nitrate be 60 g per 100 g water?

At what temperature will the solubility be 120 g per 100 g of water? Explain, citing the first part of the question as a comparison.

2) According to Table G, which gas is most soluble at 0°C? At 60°C?

3) According to Table G, which compound’s solubility decreases most rapidly when the temperature increases from 50 °C to 70 °C? Which compound’s solubility increases in the same temperature interval? Explain.

4) How many grams of sodium nitrate would be needed to saturate 200 g of water at 40 °C?

5) A supersaturated solution of 60 g of ammonium chloride is made at 30 °C and 100 g of water. How many grams of excess ammonium chloride are dissolved by the water?

6) What three factors affect the solubility of a solute dissolved in a solvent? Explain.

7) If 35 grams of potassium nitrate are dissolved in 50 g of water at 60°C, how many grams of the solute are needed to saturate the solution?

8) Describe in detail the process of dissolving an ionic salt in a polar substance. Identify the solute and solvent, and describe what will happen when the solvent evaporates.

9) Describe in your own words how to prepare 100.0 mL of a 0.85 M solution of sodium chloride.

10) A sample of 400.0 g of water is found to contain 175 mg Cd. What is the concentration in parts per million?

11) Most household bleach contains sodium hypochlorite, NaClO. A 2.84 liter bottle contains 177 g NaClO. What is the molarity of the solution?

12) A solution of lead (II) sulfate contains 0.425 g of lead (II) sulfate in 100 g of water. What is this concentration in parts per million?

13) If all the water in 430.0 mL of a 0.45 M NaCl solution evaporates, what mass of NaCl will remain?

14) What is the percent by volume of a solution that contains 35 mL in 7.5 L of solution?

15) A solution is prepared by dissolving 30.05 g of ammonium dichromate in water, then diluting it to 500 mL. What is the molarity of the solution?

16) How many grams of silver nitrate are needed to make a 3 L of a 0.65 M solution?

17) The maximum amount of lead, in parts per million, allowed by the USEPA (United States Environmental Protection Agency) is 0.05 ppm in 100g of water. Tests done on a school building was shown to have 38 mg Pb dissolved in 100 g water. Would this school pass inspection by the USEPA? Why or why not?

18) A solution of barium hydroxide contains 4.825 g dissolved in 350 mL of water. What is the molarity of the solution?

19) A carton of apple juice contains 53 % apple juice by concentrate. If 450 mL of apple juice is contained in the carton, what is the volume of the carton, assuming the entire carton contains drinkable apple juice?

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