Define pH value. What would you say abou...

Define pH value. What would you say about the pH of a solution in which (i) `H^(+)` aq. Ions= `OH^(-)` ions (ii) evolves `CO_(2)` when heated with `Na_(2)CO_(3)` (iii) `OH^(-)` ions `gt H^(+)` aq ions

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