Extraction of Metals - Result Question 72
####74. Give the number of water molecule (s) directly bonded to the metal centre in $CuSO _4 \cdot 5 H _2 O$.
(2009, 2M)
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Solution:
- Four, the complex has formula $\left[Cu\left(H _2 O\right) _4\right] SO _4 \cdot H _2 O$
$$ AgBr+2 Na _2 S _2 O _3 \longrightarrow Na _3\left[Ag\left(S _2 O _3\right) _2\right]+NaBr $$
(b) $Na _2 S _2 O _3+2 H^{+} \longrightarrow 2 Na^{+}+H _2 SO _3+S \downarrow$ Colloidal
