1.

When NH4Cl and NH4OH are added to a solution containing both, Fe3+ and Ca2+ ions, which ion is precipitated first and why? Explain 

Answer»

Addition of NH4Cl decreases the dissociation of weak base NH4OH due to the common ion effect. The concentration of OH is small but the ionic product [Fe3+] [OH3-] exceeds the K of metal hydroxide of group III and they get precipitated.



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