ICSE Class 10 Answered
Write observations and balanced equations for the following reactions. (i) Sodium hydroxide is added dropwise till in excess to a solution of Zinc sulphate. (ii) Ammonium hydroxide is added first in a small quantity and then in excess to a solution of copper sulphate.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
(i) On adding sodium hydroxide to zinc sulphate drop by drop a white precipitate is formed which is soluble in excess of sodium hydroxide.
ZnSO4 + 2NaOH → Zn (OH)2 + Na2SO4
Zn (OH)2 + 2NaOH → Na2ZnO2 + 2H2O
(Soluble salt)
(ii) On adding NH4OH drop by drop to a solution of copper sulphate a pale blue ppt. appears which dissolves in excess of NH4OH to give deep blue or inky blue solution.
CuSO4 + 2NH4OH → Cu (OH)2 + (NH4)2SO4
Cu (OH)2 + (NH4)2SO4 + 2NH4OH → [Cu(NH3)4]SO4 + 4H2O
Answered by | 04 Jun, 2014, 03:23: PM
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