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Analytical Chemistry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry5 Marks
Question
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions :
1) Copper sulphate solution
2) Zinc sulfate solution.
✓

Answer

When $NH _4 OH$ is added to copper sulphate solution drop-wise, a pale blue ppt. is obtained.
$CuSO_4+2 NH_4 OH \longrightarrow Cu(OH)_2+\left(NH_4\right)_2 SO_4+4 H_2 O$
With the excess of $NH _4 OH$, the ppt. dissolves to give a deep blue solution of tetraamine copper(II)sulphate
$Cu(OH)_2+\left(NH_4\right)_2 SO_4+2 NH_4 OH \longrightarrow\left[Cu\left(NH_3\right)_4\right]_{SO_4}+4 H_2 O$
2) When $NH _4 OH$ is added to zinc sulphate solution drop-wise, a white, gelatinous ppt. is obtained.
$ZnSO_4+2 NH_4 OH \longrightarrow Zn(OH)_2+\left(NH_4\right)_2 SO_4$
With the excess of NH 4 OH , the ppt. dissolves to give a colorless solution of tetraamine zinc(II)sulphate.$Zn(OH)_2+\left(NH_4\right)_2 SO_4+2 NH_4 OH \longrightarrow\left[Zn\left(NH_3\right)_4\right] SO_4+4 H_2 O$

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