Chemistry
The following is a list of methods for the preparation of salts:
A — direct combination of two elements
B — reaction of a dilute acid with a metal
C — reaction of a dilute acid with an insoluble base
D — titration of a dilute acid with a solution of soluble base.
E — reaction of two solutions of salts to form a precipitate.
Choose from the list A to E, the best method of preparing the following salts by giving a suitable equation in each case:
- Copper (II) Sulphate
- Calcium Carbonate
- Zinc sulphate
Acids Bases Salts
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Answer
(a) C — reaction of a dilute acid with an insoluble base
Cu(OH)2 + H2SO4 (dil.) ⟶ CuSO4 + 2H2O
(b) E — reaction of two solutions of salts to form a precipitate
CaCl2 + Na2CO3 ⟶ CaCO3 ↓ + 2NaCl
(c) B — reaction of a dilute acid with a metal
Zn + H2SO4 (dil.) ⟶ ZnSO4 + H2
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