Ferric chloride is applied to stop bleeding because -

Engineering

Chemistry

Colloids Preparation and Properties

Question

Blood absorbs FeCl₃ and forms a complex.

FeCl₃ reacts with the constituents of blood which is a positively charged sol.

Fe³⁺ ions coagulate blood which is a negatively charged sol.

Cl^– ions cause coagulation of blood.

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Blood is a negative charge colloid hence cation of FeCl₃ is Fe⁺³ will act as coagulation agent.