Solubility of formic acid in water at different temperatures and pressures

The solubility of formic acid (HCOOH) in water changes with temperature and pressure, but under normal temperature and pressure conditions, its solubility in water is very high; it can be said to be practically infinitely soluble. As the temperature rises, the solubility of formic acid generally increases. However, since both formic acid and water are polar liquids with strong interactions between them, formic acid can mix with water in almost any proportion; therefore, temperature has little effect on its solubility. Pressure has a significant effect on the solubility of gases in liquids (according to Henry’s law), but it has little impact on the solubility of liquid or solid solutes. Therefore, unless under extreme pressure conditions, the effect of pressure on the solubility of formic acid in water can generally be ignored. If specific solubility data are required, it is necessary to consult experimental data or scientific literature. .

Formic acid is miscible with water; there is no solubility limit.