Chemistry
Answer
Calcium sulphate from calcium carbonate:
Method of preparation: By Double Decomposition (precipitation)
Reaction:
CaCO3 + 2HNO3 ⟶ Ca(NO3)2 + H2O + CO2↑
Ca(NO3)2 + Na2SO4 ⟶ CaSO4↓ + 2NaNO3
Procedure:
- First insoluble Calcium Carbonate [CaCO3] is converted to soluble Calcium Nitrate [Ca(NO3)2] with the help of dilute nitric acid.
- The resulting solution is then treated with Sodium Sulphate [Na2SO4] and a precipitate of Calcium Sulphate is obtained.
Related Questions
How would you prepare zinc sulphate crystals from zinc dust (powdered zinc and zinc oxide).
How would you prepare sodium hydrogen carbonate crystals.
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:
- Anhydrous ferric chloride
- Lead chloride
- Sodium sulphate
- Copper sulphate
Name:
(a) a chloride which is insoluble in cold water but dissolves in hot water,
(b) a chloride which is insoluble
(c) two sulphates which are insoluble
(d) a basic salt,
(e) an acidic salt,
(f) a mixed salt,
(g) a complex salt,
(h) a double salt.