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Question

Solution P has a pH of 13, solution Q has a pH of 6, and solution R has a pH of 2.
Which solution:
(a) will liberate ammonia from ammonium sulphate on heating?
(b) is a strong acid?
(c) contains molecules as well as ions?

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Solution

On the pH scale, bases (or alkalis) have a pH value greater than 7, while acids have a pH value less than 7. Neutral solutions have a pH value equal to 7. According to the given data, solution P with pH value 13 is a strong base, solution Q with pH value 6 is a weak acid and solution R with pH value 2 is a strong acid.
(a) Solution P, being a strong base, liberates ammonia from ammonium sulphate on heating.
(b) Solution R with pH value 2 is a strong acid.
(c) Solution Q, being a weak acid, ionises partially and contains molecules as well as ions.

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