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Why does leather get hardened after tann...

Why does leather get hardened after tanning?

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Animal hide is colloidal in nature and has positively charged particles. When it is soaked in tanin (negatively charged), a colloid, it results in mutual cogulation and gets harden . Thus, leather get hardened after tanning.
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NCERT EXEMPLAR-SURFACE CHEMISTRY-Surface Chemistry
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  2. Why are some medicines more effective in the colloidal form?

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  3. Why does leather get hardened after tanning?

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  6. On the basis of Hardy-schulze rule explain why the coagulating power o...

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  7. Why does bleeding stop by rubbing moist alum?

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  8. Why is Fe(OH)(3) colloid positively charged when prepared by adding Fe...

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  9. Why do physisorption and chermisorption behave differently with rise i...

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  10. What happens when dialysis is prolonged?

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  11. Why does the white precipitate of silver halide become coloured in the...

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  12. What is the role of activated charcoal in gas mask used in coal mines?

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  13. How does a delta form at the meeting place of sea and river water?

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  14. Given an example where physisorption changes to chemisorption with ris...

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  15. Why is desorption important for a substance to act as good catalyst?

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  16. What is the role of diffusion in heterogeneous catalyst?

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  17. How does a solid catalyst enhance the rate of combination of gaseous ...

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  18. Do the vital functions of the body such as digestion get affected duri...

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  19. Method of formation of solution is given in Column I. Match it with th...

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  20. Match the statement given in Column I with the phenomenon given in Col...

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