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Solubility is defined as the mass of a solid required to saturate 100 g of water at a given temperature. Solubility is measured in grams of a solute per 100 g of water.

If the mass of water is not 100 g, you can scale the solubility values up or down.

A saturated solution is one in which no more solid can dissolve in the liquid at a given temperature.

Example

10 g of sodium chloride saturate 25 g of water at 20°C. What is the solubility of sodium chloride?

The solubility of sodium chloride at 20°C is 40 g/100 g water.