Solubility and Temperature Quiz

Which solute shows the least change in solubility with temperature increase?

• NaCl

• KCl

• KNO₃

• NaNO₃

Answer explanation

NaCl shows the least change in solubility with temperature increase compared to KCl, KNO₃, and NaNO₃, which have more significant solubility variations with temperature changes.

What is the solubility of KNO₃ at 60°C?

• 50 g/100 g H₂O

• 80 g/100 g H₂O

• 100 g/100 g H₂O

• 60 g/100 g H₂O

Answer explanation

At 60°C, the solubility of KNO₃ is 80 g per 100 g of H₂O. This means that in this temperature, 80 grams of KNO₃ can dissolve in 100 grams of water, making it the correct choice.

What is the general trend of gas solubility with increasing temperature?

• Solubility increases

• Solubility decreases

• Solubility remains constant

• Solubility first increases then decreases

Answer explanation

The general trend of gas solubility is that it decreases with increasing temperature. This is because higher temperatures provide more energy to gas molecules, allowing them to escape from the liquid phase into the gas phase.

Which of the following statements is true about gas solubility and temperature?

• Gas solubility increases with temperature

• Gas solubility decreases with temperature

• Gas solubility is unaffected by temperature

• Gas solubility fluctuates randomly with temperature

Answer explanation

Gas solubility decreases with temperature because higher temperatures provide more energy to gas molecules, allowing them to escape from the liquid phase into the gas phase, thus reducing solubility.

What is the solubility of O₂ at 0°C according to the graph?

• 0.5 mM

• 1.0 mM

• 1.5 mM

• 2.0 mM

Answer explanation

According to the graph, the solubility of O₂ at 0°C is indicated to be 2.0 mM, which is the highest value among the answer choices provided.

What is the effect of temperature on the solubility of gases in general?

• Increases solubility

• Decreases solubility

• No effect

• Causes random changes

Answer explanation

In general, as temperature increases, the solubility of gases in liquids decreases. This is due to increased kinetic energy, which allows gas molecules to escape from the liquid more easily, leading to lower solubility.

Which container would dissolve more gas?

• Room Temperature H2O (25°C)

• Cold H2O (5°C)

• Hot H2O (50°C)

• None of the above

Answer explanation

Cold H2O (5°C) can dissolve more gas than warmer water because gases are more soluble in cooler temperatures. As temperature increases, gas solubility typically decreases, making cold water the best choice for dissolving gas.

What happens to the solubility of a gas when the pressure above it is increased?

• It increases

• It decreases

• It remains the same

• It evaporates

Answer explanation

According to Henry's Law, the solubility of a gas in a liquid increases with an increase in pressure. Therefore, when the pressure above a gas is increased, its solubility also increases.

What effect does decreased pressure have on the solubility of a gas?

• It increases solubility

• It decreases solubility

• It has no effect

• It causes the gas to solidify

Answer explanation

Decreased pressure reduces the solubility of a gas in a liquid. According to Henry's Law, as pressure decreases, the amount of gas that can dissolve in a liquid also decreases, leading to lower solubility.

Which of the following is true about gas solubility and pressure?

• Increased pressure decreases solubility

• Decreased pressure increases solubility

• Increased pressure increases solubility

• Pressure has no effect on solubility

Answer explanation

According to Henry's Law, gas solubility in a liquid increases with increased pressure. Therefore, the correct statement is that increased pressure increases solubility.