How do I find which indicator is best for the solution? Show step by step please

Question

How do I find which indicator is best for the solution? Show step by step please.

Potassium hydrogen phthalate (KHP, M = 204.2 g/mol) is a weak monoprotic acid often used to find the concentrations of stock solutions of strong soluble bases. Consider the titration of a 1.5 g sample of KHP with a stock solution of NaOH, a strong soluble base, whose concentration is approximately 0.10 M. Which of the following would be the best indicator for the titration? Thymol blue (pKa = 2.0) Bromcresol blue (pKa = 4.5) Bromthymol blue (pKa = 6.6) o-Cresolphthalein (pKa = 9.0) All of the above indicators would be equally good for finding the equivalence point for this titration

Explanation / Answer

since acid is weak (KHP) and base is strong ( NaOH) we get equivalence point at basic pH range 8-10 . Hence the suitable indicator is d- O Cresolphthalein

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