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Question

Salts are prepared by the following methods

(a) Direct combination

(b) Displacement

(c) Double decomposition (precipitation)

(d) Neutralisation of insoluble base

(e) Neutralisation of an alkali (titration)

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Solution

(a) Direct combination
2 F e plus 3 C l subscript 2 rightwards arrow 2 F e C l subscript 3

(b) Displacement
2 N a plus B a C l subscript 2 leftwards arrow over rightwards arrow for blank of B a plus 2 N a C l

(c) Double decomposition (precipitation)
P b left parenthesis N O subscript 3 right parenthesis subscript 2 plus H subscript 2 S O subscript 4 rightwards arrow P b S O subscript 4 plus 2 N H subscript 3

(d) Neutralisation of insoluble base
C u O plus H subscript 2 S O subscript 4 rightwards arrow C u S O subscript 4 plus H subscript 2 O

(e) Neutralisation of an alkali (titration)
2 N H subscript 4 O H plus H subscript 2 S O subscript 4 rightwards arrow left parenthesis N H subscript 4 right parenthesis subscript 2 S O subscript 4 plus H subscript 2 O


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