• # question_answer Why in Group V of qualitative analysis, sufficient $N{{H}_{4}}OH$ solution should be added before adding${{(N{{H}_{4}})}_{2}}C{{O}_{3}}$ solution?

This is done to convert $N{{H}_{4}}HC{{O}_{3}}$ usually present in large amounts along with ${{(N{{H}_{4}})}_{2}}C{{O}_{3}}$ to ${{(N{{H}_{4}})}_{2}}C{{O}_{3}}$ $N{{H}_{4}}HC{{O}_{3}}\,+N{{H}_{4}}OH\xrightarrow{\,}\,{{(N{{H}_{4}})}_{2}}C{{O}_{3}}+{{H}_{2}}O$