Given below are two statements:

Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II): In this titration phenolphthalein c

Question

Given below are two statements:

Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II): In this titration phenolphthalein can be used as indicator.

In the light of the above statements, choose the most appropriate answer from the options given below:

Canvas Classes · Accepted Answer

Step 1 — Evaluate Statement I:

Potassium hydrogen phthalate (KHP, , MW = 204.22 g/mol) is an excellent primary standard for NaOH because:
- It is available in high purity
- It is stable in air (not hygroscopic)
- It has a high molar mass (reduces weighing errors)
- It reacts stoichiometrically with NaOH:

Statement I is CORRECT ✓

Step 2 — Evaluate Statement II:

The titration of KHP (weak acid) with NaOH (strong base) produces a basic solution at the equivalence point (pH ≈ 8–9). Phenolphthal

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