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(a) a solution has a pH of 7. Explain ho...

(a) a solution has a pH of 7. Explain how you would you :
(i) increase its pH (ii) decreases its pH
(b) If a solution the colour of the litmus from red to blue, what can you say about its pH ?
(c ) What can you say about the pH of a solution that liberates carbon dioxide from sodium carbonate ?

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