Oldatok 2

Multiple Choice

Which compound's solubility decreases most rapidly as the temperature changes from 10°C to 70°C

• NH₄Cl

• NH₃

• HCl

• KCl

Multiple Choice

A solution contains 14g of KCl in 100g of water at 40°C. What is the minimum amount of KCl that must be added to make this a saturated solution?

• 14g

• 19g

• 25g

• 44g

Multiple Choice

What happens when a crystal of a salt is dropped in an unsaturated solution of the same salt?

• excess solute crystals form

• the crystal dissolves

• the crystal drops to the bottom, unchanged

• the solution becomes colorless

Multiple Choice

What happens when a crystal of a salt is dropped in an supersaturated solution of the same salt?

• excess solute crystals form

• the crystal dissolves

• the crystal drops to the bottom, unchanged

• the solution becomes colorless

Multiple Choice

According to Reference Table G, which solution is saturated at 30°C?

• 12 grams of KC1O₃ in 100 grams of water

• 12 grams of KC1O₃ in 200 grams of water

• 30 grams of NaCl in 100 grams of water

• 30 grams of NaCl in 200 grams of water

Multiple Choice

An unsaturated solution is formed when 80 grams of a salt is dissolved in 100 grams of water at 40°C. This salt could be

• KCl

• KNO₃

• NaCl

• NaNO₃

Multiple Choice

A student prepares four aqueous solutions, each

with a different solute. Which solution is saturated?

• 1

• 2

• 3

• 4

Multiple Choice

A saturated solution of NaN0₃ is prepared at 60°C using 100 grams of water. As this solution is cooled to 10°C, NaN0₃ precipitates (settles) out of the solution. The resulting solution is saturated. Approximately how many grams of NaN0₃ settled out of the original solution?

• 46g

• 61g

• 85g

• 126g

Multiple Choice

Based on Reference Table G, what is the maximum number of grams of KCI_(s) that will dissolve in 200 grams of water at 50°C to produce a saturated solution?

• 38g

• 42g

• 58g

• 84g

Multiple Choice

At STP, which of these substances is most soluble in H₂0?

• NH₃

• KCl

• HCl

• NaNO₃