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Question
A solution has a pH of 7. Explain, how you would:
(i) increase its pH
(ii) decrease its pH
If a solution changes the colour of litmus from red to blue, what can you say about its pH?
(i) increase its pH
(ii) decrease its pH
If a solution changes the colour of litmus from red to blue, what can you say about its pH?
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Solution
A solution with a pH value of 7 is a neutral solution.
(i) To increase the pH value of a neutral solution, we need to add a base to it because bases have a pH value greater than 7.
(ii) To decrease the pH value of a neutral solution, we need to add an acid to it because acids have a pH value less than 7.
If a solution changes the colour of litmus from red to blue, then its pH value is greater than 7. Also, it is basic in nature.
(i) To increase the pH value of a neutral solution, we need to add a base to it because bases have a pH value greater than 7.
(ii) To decrease the pH value of a neutral solution, we need to add an acid to it because acids have a pH value less than 7.
If a solution changes the colour of litmus from red to blue, then its pH value is greater than 7. Also, it is basic in nature.
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