Chemistry
Explain why :
(a) it is necessary to find out the ratio 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.
Acids Bases Salts
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Answer
(a) Since sodium hydroxide and sulphuric acid both are soluble, an excess of either of them cannot be removed by filtration. Therefore, it is necessary to find out on a small scale, the ratio of the solutions of the two reactants required for complete neutralisation before preparation.
(b) Iron (III) Chloride (FeCl3) is highly deliquescent. So, to keep it dry fused calcium chloride is used which is a drying agent.
(c) Anhydrous FeCl3 cannot be prepared by heating the hydrated Iron (III) chloride (FeCl3.6H2O) because on heating, FeCl3.6H2O produces Fe2O3, H2O, HCl.
2[FeCl3.6H2O] Fe2O3 + 9H2O + 6HCl
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