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(i) Draw a labelled diagram to show the preparation of hydrogen chloride gas in the laboratory.(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases, does the litmus paper show change in colour?(iii) State the reason of exhibiting acidic character by dry HCl gas / HCl solution.
(i) The labelled diagram shows the preparation of hydrogen chloride gas in the laboratory:
(ii) The colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H+ ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.
(iii) Amongst dry HCl gas and HCl solution, HCl solution will show acidic properties. This is because dry gas does not show any effect on the pH paper or the litmus paper as it is not composed of H+ ions which are an essential component of an acid.
Updated on: 10-Oct-2022
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