Explain why :
(a) It is necessary to find out the ration of reactants required in the preparation of sodium sulphate,
(b) Fused calcium chloride is used in the preparation of FeCl3?
(c) Anhydrous FeCl3 cannot be prepared by heating hydrated Iron (III) chloride.
Explain why :
(a) It is necessary to find out the ration of reactants required in the preparation of sodium sulphate,
(b) Fused calcium chloride is used in the preparation of FeCl3?
(c) Anhydrous FeCl3 cannot be prepared by heating hydrated Iron (III) chloride.
(a) In the preparation of sodium sulphate, sodium hydroxide and sulphuric acid are both soluble and excess of any of them can not be removed by filtration. Thus it is necessary to find out the ratio of the solutions of the two reactants required for complete neutralisations. And it is necessary to find out the ratio of reactants required in the preparation of sodium sulphate because it is a compound that requires a fixed proportion of elements to be formed and if there is some difference in the ratio sodium sulphate won't be formed.
(b) FeCl3 is highly deliquescent, so it is kept dry with the help of fused calcium chloride.
(c) Hydrated ferric chloride decomposes on heating to Fe2O3 and releases HCl
2FeCl3.6H2O⟶Fe2O3+6HCl
(a) In the preparation of sodium sulphate, sodium hydroxide and sulphuric acid are both soluble and excess of any of them can not be removed by filtration. Thus it is necessary to find out the ratio of the solutions of the two reactants required for complete neutralisations. And it is necessary to find out the ratio of reactants required in the preparation of sodium sulphate because it is a compound that requires a fixed proportion of elements to be formed and if there is some difference in the ratio sodium sulphate won't be formed.
(b) FeCl3 is highly deliquescent, so it is kept dry with the help of fused calcium chloride.
(c) Hydrated ferric chloride decomposes on heating to Fe2O3 and releases HCl
2FeCl3.6H2O⟶Fe2O3+6HCl
