The 0.25 mol/l potassium hydroxide solution is a dilute alkaline solution used in various laboratory and industrial applications. Because of its moderate alkalinity, it is suitable in applications where a mild alkaline reaction is required.

In microbiology, the 0.25 mol/l potassium hydroxide solution can be used to distinguish yeasts and filamentous fungi by soaking samples in the solution and then examining them microscopically.

The 0.25 mol/l caustic potash solution can also be used in the chemical industry to produce soaps and detergents when a less aggressive alkalinity is needed. In the textile industry, it can be used to remove grease and dirt, while in the food industry it is used to regulate pH and as a preservative.

In the laboratory, the 0.25 mol/l caustic potash solution is used as a mild etchant to remove proteins and grease from glassware or to neutralize acids. In addition, it can serve as a buffer solution or as a starting solution for the preparation of other potassium hydroxide concentrations.