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Surface active agents -- Determination of the power to disperse calcium soap -- Acidimetric method (Modified Schoenfeldt method)
A 0.5 % (m/m) aqueous soap solution is prepared, and after maintaining this at testing temperature for 24 h, an aliquot portion of this solution is taken.
This aliquot portion is mixed with a dilute solution of the dispersing agent (surface active agent) and subsequently with a specified volume of water of known calcium hardness.
The mixture is maintained for 1 h at the testing temperature and then the calcium soap present in an aliquot portion of the lower layer is titrated with a standard volumetric solution of hydrochloric acid in the presence of bromcresol green as indicator.
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