In the laboratory preparation of hydrochloric acid, hydrogen chloride gas is dissolved in water.
(iii) Write balanced chemical equations for the laboratory preparation of $H C l$ gas when the reaction is :
A. Below $200^{\circ} C$
B. Above $200^{\circ} C$

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Solution

Balanced chemical equations for the laboratory preparation of $H C l$ gas:
(A) Below $200^{\circ} C$
$N a C l + H_{2} S O_{4} below 200^{\circ} C ⟶ N a H S O_{4} + H C l ↑$

(B) Above $200^{\circ} C$
$2 N a C l + H_{2} S O_{4} above 200^{\circ} C ⟶ N a_{2} S O_{4} + 2 H C l ↑$

At temperatures greater than $200^{\circ} C$ sodium sulphate is formed which forms a hard crust which sticks to the glass surface and is difficult to remove.

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Similar questions

In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.
(i) Draw a diagram to show the arrangement used for the absorption of HCl in water.
(ii) Why is such an arrangement necessary? Give two reasons.
(iii) Write the chemical equation for the laboratory preparation of HCl gas when the reactants are:
(a) below 200°C
(b) above 200°C

(a) Name the chemicals required for the preparation of carbon dioxide in the laboratory.

(b) How will you collect the gas?

(d) Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory?

Explain, why (or give reasons for)
(i) In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained below 200°C or above. But the lower temperature is preferred.
(ii) Hydrogen chloride is not collected over water.
(iii) Hydrochloric acid cannot be concentrated above 22.2% by boiling.
(iv) HCl gas does not conduct electricity, but hydrochloric acid conducts electricity.
(v) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(vi) When the stopper of a bottle full of HCl gas is opened there are fumes in the air.
(vii) A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCl gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.
(viii) An aqueous solution of chlorine is acidic in nature.

Write the chemical equation for the laboratory preparation of HCl gas when the reactants are above $200 ° C$

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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Laboratory Method of Preparation

Standard X Chemistry

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In the laboratory preparation of hydrochloric acid, hydrogen chloride gas is dissolved in water. (iii) Write balanced chemical equations for the laboratory preparation of HCl gas when the reaction is : A. Below 200∘C B. Above 200∘C

In the laboratory preparation of hydrochloric acid, hydrogen chloride gas is dissolved in water.
(iii) Write balanced chemical equations for the laboratory preparation of $H C l$ gas when the reaction is :
A. Below $200^{\circ} C$
B. Above $200^{\circ} C$