Question

9. State reason for the following :
(i) dry HCl gas does not change the colour of the
dry blue litmus paper.
(ii) alcohol and glucose also contain hydrogen, but
do not conduct electricity.
(iii)Conc. of H3O+ ion is affected when a solution
of an acid is diluted.
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Answer 1

i)It is the hydrogen ions that are dissociated in the water of aqueous acid that change the colour of the paper. Gaseous HCL has no free hydrogen ions, so it will not change the color of Blue litmus.

ii) The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. The aqueous solutions of glucose and alcohol do not show acidic character because the hydrogen in them does not separate out as hydrogen ions [H+ (aq) ions] on dissolving in water.

iii) When the concentrated solution of an acid is diluted by mixing water, the concentration of hydronium ions H3O+ per unit volume decreases.

Answer 2

Hey mate...

1)Dry HCl does not change the colour of litmus paper because water is required for the formation of hydronium ions which is responsible for the colour change of litmus paper.

2) The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. The aqueous solutions of glucose and alcohol do not show acidic character because the hydrogen in them does not separate out as hydrogen ions [H+ (aq) ions] on dissolving in water.

3) When the concentrated solution of an acid is diluted by mixing water, the concentration of hydronium ions H3O+ per unit volume decreases.

hope it helped