pBlock ElementsII - Result Question 85
####81. (a) Thionyl chloride can be synthesised by chlorinating $SO _2$ using $PCl _5$. Thionyl chloride is used to prepare anhydrous ferric chloride starting from its hexahydrated salt. Alternatively, the anhydrous ferric chloride can also be prepared from its hexahydrated salt by treating with 2,2-dimethoxypropane. Discuss all this using balanced chemical equations.
(b) Reaction of phosphoric acid with $Ca _3\left(PO _4\right) _2$ yields a fertiliser “triple superphosphate” represent the same through balanced chemical equation.
$(1998,5 M)$
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Solution:
- (a)
$$ PCl _5+SO _2 \longrightarrow POCl _3+SOCl _2 $$
(b) $Ca _3\left(PO _4\right) _2+4 H _3 PO _4 \longrightarrow \underset{\text { triple superphosphate }}{3 Ca\left(H _2 PO _4\right) _2}$
