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Question
Two solutions X and Y have Ph values of 4 and 10 respectively. Which one of these two will give a pink colour with phenolphthalein indicator?
Solution
The concentration of H+(aq) ions determines if a solution is acidic, alkaline, or neutral.
Solution X, with a pH of 4, is acidic and will not affect the colourless phenolphthalein solution but solution Y, with a pH of 10, is basic and leads the phenolphthalein indicator to change colour to pink.
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