Final answer:
The equivalence point of potassium hydrogen phthalate (KHP), a weak acid, with a strong base is greater than pH 7.0, so the correct answer is 2) pH 7.0. Option 2 is correct.
Step-by-step explanation:
The equivalence point of potassium hydrogen phthalate (KHP) can be determined by considering that KHP is a monoprotic weak acid. When titrating a weak acid with a strong base, such as NaOH, the pH at the equivalence point will be greater than 7.0 due to the production of the conjugate base of the weak acid, which weakly dissociates, raising the pH above neutral. Therefore, the correct option is:
2) pH 7.0
It is important to select an appropriate indicator that changes color at a pH greater than 7.0, such as phenolphthalein or thymol blue, as these have pKin values above 7.0. Other common equivalence points, such as those for polyprotic acids like phosphoric acid (H3PO4), have different equivalence points depending on which proton is being titrated, but this is not directly relevant to KHP, which only has one acidic hydrogen.