Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryIonic Equilibria2 Marks
Question
What is common ion?
✓
Answer
Common ion: An ion common to two electrolytes is called common ion. This is generally applicable to a mixture of a strong and a weak electrolyte. For example, a solution containing weak electrolyte $CH _3 COOH$ and strong electrolyte salt $CH _3 COONa$. $\begin{aligned} & CH _3 COONa \rightarrow CH _3 COO ^{-}+ Na ^{+} ; \\ & CH _3 COOH \rightleftharpoons CH _3 COO ^{-}+ H ^{+} \end{aligned}$
Hence $CH _3 COOH$ and $CH _3 COONa$ have a common ion $CH _3 COO ^{-}$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.