What specific surface chemistry mechanism justifies the common analytical technique of washing a fresh precipitate with a highly dilute electrolyte solution instead of pure distilled water during grav

Question

What specific surface chemistry mechanism justifies the common analytical technique of washing a fresh precipitate with a highly dilute electrolyte solution instead of pure distilled water during gravimetric analysis?

Prashant Kotian · Accepted Answer

Correct answer: B. Washing a bulky precipitate with pure water can entirely wash away the tiny amount of electrolyte holding the coagulated mass together. Without these neutralizing ions, the particles regain their repulsive double layers and strictly peptize back into a colloidal sol, slipping right through the filter paper.

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