มอก. 2822-2560

Scope (English)

This standard specifies two methods of determining free caustic alkali in commercial soaps, excluding compounded products : - Method A, ethanol method should be applied to sodium soaps. The soap is dissolved in neutralized ethanol, and the free caustic alkali is titrated with an ethanol solution of hydrochloric acid. - Method B, barium chloride method should be applied to potassium soaps or mixed sodium and potassium soaps. 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.