Question

why does leather get hardened after tanning.

Answer 1

The process of hardening of leather is known as tanning. Tannin, which is obtained from a mixture of polyhydroxy benzoic acids and contains negatively charged colloidal particles. Animal skin is colloidal in nature and has positively charged particles. When they are soaked in tannin, their mutual coagulation takes place and, thus leather becomes hard after tanning.
(ii) Lyophilic sols are more stable than lyophobic sols. This is due to the fact that lyophilic colloids are extensively solvated, i.e. colloidal particles are covered by a sheath of the liquid in which they are dispersed.
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Answer 2

Hey !!

Animal hides are colloidal in nature. When a halide, which has positively charged particles, is soaked in tannin, which contains negatively charged colloidal particles, mutual coagulation takes place. This results in the hardening of leather.

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