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Surface active agents -- Analysis of soaps -- Determination of free caustic alkali
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 ethanol solution of hydrochloric acid.
The second way includes precipitating the soap and carbonate with barium chloride and determining the residual alkalinity of the solution, representing the alkalinity of the free potassium hydroxide.
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