Solubility of Common Salts

Use the graph titled "Solubility of Common Salts" to determine: A KNO3 solution hits its saturation when 75 g of salt have dissolved. At which temperature is the solution?

• 15°C

• 25°C

• 45°C

• 55°C

Which action would allow 40 g of K2Cr2O7 to completely dissolve in 100g of water?

• heating the solution to approximately 60°C

• heating the solution to approximately 40°C

• cooling the solution to approximately 20°C

• cooling the solution to approximately 0°C

Which of the following refers to the concentration of a substance?

• the size of the particles that make up a substance

• the grams of solute dissolved per 100 g of solvent

• the minimum volume of solvent dissolved per liter of solution at a given pressure

• the maximum amount of a solute that can be dissolved in a solvent at a given temperature

Which of the following molecules is the best conductor of electricity? (**aq = dissolved in water)

• C2H5OH (aq)

• NaCl(s)

• C2H5OH (s)

• NaCl(aq)

The table below shows four solutions that were prepared by dissolving salt in water. Which of the solutions has the lowest salt concentration?

• Solution A

• Solution B

• Solution C

• Solution D

An increase in temperature will tend to change the solubility of a solid and a gas in a liquid in which ways?

• A. It will reduce the solubility of the solid and the gas.

• B. It will increase the solubility of the solid and the gas.

• C. It will increase the solubility of the solid and reduce the solubility of the gas.

• D. It will reduce the solubility of the solid and increase the solubility of the gas.

Which of the following is NOT a way to increase the solubility of a solid in water?

• crushing the solid

• shaking the mixture of solid and water

• raising the temperature of the water

• letting the mixture stand still a long time

A student dissolved 11 g of a solid solute, Q, into 67 g of a liquid solvent, R, at 50°C to form a clear solution. After 10 minutes, white crystals began to form in the solution. Which of the following most likely occurred?

• A. The solution cooled and the solubility of Q increased.

• B. The solution cooled and the solubility of Q decreased.

• C. The solution warmed and the solubility of Q increased.

• D. The solution warmed and the solubility of Q decreased.

Which factor explains why a cube of sugar placed in water will dissolve at a slower rate than granular sugar over time?

• The mass of the cube decreases.

• The cube has a less surface area.

• The temperature of the cube decreases.

• The particles in the cube have more movement.

As a carbonated drink, such as soda, is heated, what happens to the solubility of carbon dioxide gas in the drink?

• A. It increases.

• B. It decreases.

• C. It is not affected.

• D. It can increase or decrease.