Table G Regents Chemistry

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

• NH₄Cl

• NH₃

• HCl

• KCl

A solution contains 25 g of NaNO₃ in 100g of water at 40°C. What is the minimum amount of NaNO₃ that must be added to make this a saturated solution?

• 40g

• 60g

• 80g

• 105g

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

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

According to Reference Table G, which solution is saturated at 70°C?

• 12 grams of KC1O₃ in 100 grams of water

• 12 grams of KC1O₃ in 200 grams of water

• 62 grams of NH₄Cl in 100 grams of water

• 62 grams of NH₄Cl in 200 grams of water

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

• KCl

• NaNO₃

• KI

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as

• homogeneous and supersaturated

• heterogenous and supersaturated

• homogeneous and unsaturated

• heterogeneous and unsaturated

A saturated solution of KI is prepared at 20°C using 100 grams of water. As this solution is cooled to 10°C, KI precipitates (settles) out of the solution. The resulting solution is saturated. Approximately how many grams of KI settled out of the original solution?

• 145g

• 135g

• 20g

• 10g

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

• 46g

• 66g

• 76g

• 86g

According to reference table G at STP, which of these substances is most soluble in H₂0?

• NH₃

• KCl

• HCl

• NaNO₃