At 20 °C, the solubility of citric acid in water is 59.2 g/100 g of solution. This means that at this temperature, no more citric acid can be dissolved in water. The solution is said to be saturated.

The saturation point of a substance in water is the maximum amount of that substance that can be dissolved in water at a given temperature. When a solution is saturated, the dissolved substance is in equilibrium with the solid form of the substance. This means that the rate at which the solid substance dissolves is equal to the rate at which the dissolved substance crystallizes out of the solution.