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In the alkalinity measurement, if the value of P = 0, thena.The water sample has its pH equal to 9.5b.The water sample has its pH lower than 8.3c.The water sample has its pH equal to 9d.The water sample has the alkalinity due to hydroxide ionsClear my choice

Question

In the alkalinity measurement, if the value of P = 0, thena.The water sample has its pH equal to 9.5b.The water sample has its pH lower than 8.3c.The water sample has its pH equal to 9d.The water sample has the alkalinity due to hydroxide ionsClear my choice

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Solution

In the context of alkalinity measurement, the value of P refers to the phenolphthalein alkalinity. If P = 0, it means that there are no alkaline substances in the water that can react with phenolphthalein to change its color. Phenolphthalein changes color at a pH of 8.3, so if P = 0, it means that the pH of the water is less than 8.3. Therefore, the correct answer is:

b. The water sample has its pH lower than 8.3

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