可通过乙醇法或氯化钡法以两种不同的方式进行测定。在第一种情况下，将肥皂溶解在中和的乙醇中，用盐酸乙醇溶液滴定游离的苛性碱。第二种方法包括用氯化钡沉淀肥皂和碳酸盐，并测定溶液的残余碱度，代表游离氢氧化钾的碱度。

The determination may be carried out in two different ways by the ethanol method or the barium chloride method. In the first case the soap is dissolved in neutralized ethanol, and the free caustic alkali is titrated with an ewthanol solution of hydrochloric acid. The second way includes precipitating of soap and carbonate with barium chloride and determining of the residual alkalinity of the solution, representing the alkalinity of the free potassium hydroxide.