Wednesday, 13 March 2013

Why does dry HCl gas not change the colour of the dry litmus paper?

Question 3. Why does dry HCl gas not change the colour of the dry litmus paper?
Answer: 
The colour of litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions. HCl can produce these ions only in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper.

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