Question

Give the function of salt bridge in an iron vessel?Why?

Answer 1

Explanation:

The purpose of salt bridge is not to move electrons from electrolyte, rather it's to maintain charge balance because electrons are moving from one-half cell to other

Answer 2

Answer:

Explanation:

When we measure the emf of a cell formed by two Solutions, in order to make a contact between the two, a filter paper moistened with certain salt Solution is used. Generally a salt bridge prepared by using agar- agar is preferred.

When salts containing equal mobilities of anion and cations are used the potential due to liquid junction will be minimised are nullified.

Salts like KCl and NH4NO3 are used as salt bridges to avoid liquid junction potential. The ionic mobilities of ions are given below.

If the cation and Anion of an electrolyte have almost equal mobilities, then those salts or electrolytes can be used as salt bridge.

Ion========= > mobility

K+==========> 7.60 m^2 S^-1 V^-1

Cl-==========> 7.92 “””

NO3– ========> 7.42 “’’

NH4+ =======> 7.62 “””’’

Here when solutions like AgNO3 are used then in that case we should not use KCl, as it would form a prepitate of AgCl. In those cases we have to use KNO3, or NH4NO3.