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Alum is used to treat minor cuts after s...

Alum is used to treat minor cuts after shaving . Explain.

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Blood is a colloidal solution of albumin with negatively charged particles, while alum is an effective coagulant with positively charged `(Al^(3+))` ions. `Al^(3+)` ions of alum neutralise the negative charges on the colloidal particles and cause coagulation. Thus, blood clots around the wound. Hence, a piece of alum rubbed after shaving prevents bleeding.
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