Question

Explain, what is observed when
(a)
dispersion medium begins to move in an electric field,
(b) animal hides are soaked in tannin, and

(c) electrified sand is sprayed on clouds.​

Answer 1

Answer:

1.The movement of colloidal particles under an applied electric potential is called electrophoresis . When this dispersion medium begins to move in an electric field. This phenomenon is termed as electroosmosis.

2.Tanning – Animal hides are colloidal in nature. When a hide that has positively charged particles is soaked in tannin/chromium salts, which contains negatively charged particles , mutual coagulation takes place. This results in the hardening of leather. This process is termed as tanning

3.On spraying oppositely charged colloidal dust or sand particles over a cloud from an aeroplane the colloidal water particles present in the cloud will get neutralized and as a result they will come closer and will grow in size to form bigger water drops and ultimately will coagulate or precipitate causing artificial .