1.

During the preparation of soap the addition of common salt allows the precipitation of soap . Expalin the principle involved (Soap is the sodium saltof carboxylic acid ).

Answer»

SOLUTION :The addition of comon salt RESULTS in the addition of `Na^(+)` ions. Equilibriumexist between sodium and stearate ions. The addition of `Na^(+)` ions shifts the equilibrium TOWARDS LEFT thus sodium stearte precipitates.
`RCOO^(-)Na^(+) HARR RCOO^(-)+Na^(+)`.


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