(a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid?
(b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]

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Solution

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(a) High temperature is avoided because it results in the formation of hard crust of $N a_{2} S O_{4}$ which sticks to the apparatus and its removal becomes difficult. The glass apparatus in which the reaction is carried out may also break at high temperature.
(b) Sodium chloride is cheap, therefore, it is preferred for preparation of HCI over other metal chlorides.

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In the preparation of hydrogen chloride from sodium chloride and sulphuric acid, the sulphuric acid used should be concentrated

To prepare hydrogen chloride from sodium chloride and concentrated sulphuric acid.

Write the equation for:
(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(b) the reaction between hydrogen chloride and ammonia.

(a) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

Q. (i) Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular acid preferred to other acids?
(ii) Write the balanced chemical equation for the laboratory preparation of hydrogen chloride gas.

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(a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid? (b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]

(a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid?
(b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]