Question

What is common ion effect? Explain with reference to the Group 2 reagents.

Answer 1

The dissociation of a weaker acid can be suppressed or stopped by the addition of stronger acids which is known as common ion effect

Let's check about group || reagents

`\\ \rm\rightarrowtail H_2S\longrightarrow H^++S^(2-)`

`\\ \rm\rightarrowtail HCl \longrightarrow H^++Cl^-`

Here Hydrogen sulphide is neutralized by a stronger acid HCl