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) $Ca _3\left(PO _4\right) _2+4 H _3 PO _4 \longrightarrow \underset{\text { triple superphosphate }}{3 Ca\left(H _2 PO _4\right) _2}$
BETA
