Which of the following is TRUE? A) The equivalence point is where the amount of acid equals the amount of base during any acid-base titration. B) At the equivalence point, the pH is always 7. C) An indicator is not pH sensitive. D) A titration curve is a plot of pH vs. the [base]/[acid] ratio. E) None of the above is true.

E) None of the above is true

Explanation:

A) is wrong. The unit for amount of substance is the mole. The moles of acid equal the moles of base only when the molar ratio is 1:1. If the molar ratio is different, you will use different moles of acid and base used to reach the equivalence point.

B) is wrong. The pH = 7 only for a strong acid-strong base titration. If you have a weak acid or base, the pH at the equivalence point will not be 7.

C) is wrong. An indicator is pH sensitive. It shows distinct colours in different pH ranges.

D) is wrong. A titration curve is a plot of pH vs. the volume of titrant.

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