Why does leather get hardened after tanning? - Vidyadip

Question

Why does leather get hardened after tanning?

✓

Answer

Animal skin is colloidal, in nature and carries positive charge. Tannin is a negatively charged colloidal solution. When leather is soaked in tannin, mutual coagulation of the two takes place and leather gets hardened.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Surface Chemistry→Surface Chemistry — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

What happens when

$HCl$ is added to $MnO_2?$
$PCl_5$ is heated?

Write the equations involved.

Write down uses of lanthanoids and its compounds.

Arrange the following compound in increasing order of their reactivity in nucleophilic addition reaction.
Ethanal, Propanal, Propanone, Butanone.

Copper crystallises into a fcc lattice with edge length $3.61 \times 10^{–8}$ cm. Show that the calculated density is in agreement with its measured value of $8.92\ g\ cm^{–3}.$

which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?
Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?

State two main functions of carbohydrates.

Arrange the following compounds in increasing order of acidity and give a suitable explanation.
Phenol, o-nitrophenol, o-cresol.

Predict the products of electrolysis in each of the following:
An aqueous solution of $AgNO_3$ with platinum electrodes.

Explain the following:
Generally sulphide ores are converted into oxides before reduction.

The mixture of ethyl alcohol and cyclohexane shows positive deviation from Raoult's law. Why?