12 An increase in the temperature of a solution usually A in

12.) An increase in the temperature of a solution usually A) increases the boiling point B) increases the solubility of a gas in the solution C) increases the solubility of a solid solute in the solution D) decreases the solubility of a solid solute in the solution E) decreases the solubility of a liquid solute in the solution 13. According to Henry\'s law, the solubility of a gas in a liquid A) decreases as the gas pressure above the liquid increases B) increases as the gas pressure above the liquid increases C) remains the same as the temperature increases D) depends on the liquid polarity E) depends on the liquid density 14. The mass percent concentration refers to A) grams of solute in 1 kg of solvent B) grams of solute in 1 kg of solution C) grams of solute in 100 g of solvent D) grams of solute in 100 g of solution E) grams of solvent in 100 g of solution 15. What is the concentration, in mass percent (m/m), of a solution prepared from 50.0 g NaCI and 150.0 g of water? A) 0.250% (m/m) B) 33.3% (mm) C) 40.0% (m/m) D) 25.0% (mm) E) 3.00% (m/m) 16. Rubbing alcohol is 70.% (v/v) isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container? A) 70. mL B) 0.15 mL C) 680 mL D) 470 mL E) 330 mL 17. What is the concentration, mass/volume percent (m/v), of a solution prepared from 50. g NaCI and 2.5 L of water? A) 5.0% (m/v) B) 2.0% (m/v) C) 0.00% (m/v) D) 0.050% (m/v) E) 20% (m/v)

Solution

Ans 12C: An increase of temperature usually increases the solubility of a solid solute in the solution.

Ans13B: According to the law, as the partial pressure of the gas over the liquid increases, the solubility of the gas in the liquid increases.

And 14D: mass of solute/ mass of solution*100 = grams of solute in 100 g of a solution.

Ans 15D: NaCl = 50.0g water = 150g mass concentration = 50/(50+150)*100 = 50/200*100 = 25%

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