Question

Zn amalgam is prepared by electrolysis of aqueous Zncl2 using 9gm hg cathode. How much current is to be passed through zncl2 solution for 1000 seconds to prepare a zn amalga with 20% by weight

Answer 1

Answer:

8.85

Explanation:

Electrolysis element = Zncl2 (Given)

Value of cathode = 9gms (Given)

Zn = 65.4

Let x gm of Zn deposit on 9 gm of Hg

Percentage % of of Zn in Amalgam = x/9+x ×100 = 25

Therefore x = 3gm

Eq. of Zn = 3×2/65.4

Current = 6/65.4 × 96500/1000

= 8.85

Thus, the current required is 8.85