Solubility

Why is it important to quote solubility at a given temperature?

All substances that you are likely to meet have solubilities that are affected by temperature, so it is important to quote the temperature at which the solubility measurements were taken.

What happens to the solubility of a gas as the pressure increases?

As the pressure increases, all gases become more soluble.

What will happen to a hot saturated solution of copper(II) sulfate as the temperature decreases?

As the temperature falls, so does the solubility. This means that crystals will form as the solution becomes supersaturated.

Which has more carbon dioxide dissolved in it?

The lower the temperature, the more carbon dioxide will dissolve into the water in the lemonade.

In a solution, what term is given to the solid that has dissolved?

The solid that has been dissolved is called the solute.

In a solution, what term is given to the liquid?

The solvent is the liquid that does the dissolving. Water is a common solvent.

For most gases, what happens to the solubility as the temperature increases?

Most gases become less soluble as the temperature increases.

For most solid solutes, what happens to the solubility as the temperature increases?

Most solids become more soluble as the temperature increases. There are some exceptions though.

Which of the following is a typical unit of solubility?

Solubility is typically measured in grams of solute that can be dissolved into 100 cm3 of solvent.

What term is given to a substance that can dissolve in a particular liquid?

Something is soluble in a given liquid if it is capable of dissolving.