What are the important precautions? - Vidyadip

Question

What are the important precautions?

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Answer

Important precautions are -
(i)The lower end of thistle funnel must be dipped below the concentrated $H _2 SO _4$.
(ii) Temperature should be maintained nearly $200^{\circ} C$ because at higher temperature -
(a) The apparatus may break
(b) Fuel is wasted.
(c) Sodium sulphate formed in the reaction forms a crust on the surface which is difficult to remove.

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