(a) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions?

(b) The pH values of three acids A, B and C having equal molar concentrations are 5.0, 2.8 and 3.5 respectively. Arrange these acids in the increasing order of acid strengths.

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Solution

a) This means the cold drink is an acid.

When you dip a blue litmus into the cold drink it changes into red colour.
When you dip a red litmus into the cold drink it does not change colour.

b) A < C < B

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