Chemistry Practice Problems Acid Base Indicators Practice Problems Solution: Potassium hydrogen phthalate, known as KHP (molar ...

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Solution: Potassium hydrogen phthalate, known as KHP (molar mass = 204.22 g/mol), can be obtained in high purity and is used to determine the concentration of solutions of strong bases by the reactionHP - (aq) + OH - (aq) → H2O (l) + P 2- (aq)If a typical titration experiment begins with approximately 0.5 g KHP and has a final volume of about 100 mL, what is an appropriate indicator to use? The pKa for HP - is 5.51.

Problem

Potassium hydrogen phthalate, known as KHP (molar mass = 204.22 g/mol), can be obtained in high purity and is used to determine the concentration of solutions of strong bases by the reaction

HP (aq) + OH - (aq) → H2O (l) + P 2- (aq)

If a typical titration experiment begins with approximately 0.5 g KHP and has a final volume of about 100 mL, what is an appropriate indicator to use? The pKa for HP - is 5.51.