Question

1. A potassium hydroxide titrant is standardized using potassium hydrogen phthalate. What is the concentration of the titrant if 0.6082 g of KHP requires 38.17 mL to reach the phenolphthalein endpoint?

2. What is the concentration of citric acid in an unknown sample if a 10.00 mL aliquot requires 42.78 mL of the above standardized titrant to reach the phenolphthalein endpoint?

3. How many grams of potassium hydrogen phthalate should be used to standardize 0.200 M potassium hydroxide titrant in order to use 40.00 mL of the titrant?

4. What is the concentration of a citric acid sample if a 25.00 mL aliquot requires 18.4 mL of 0.200 M KOH titrant to reach the endpoint.

5. What is the concentration of a potassium hydroxide titrant if 43.82 mL of titrant is required to reach the endpoint when titrating 0.427 g of KHP?

6. How much 0.200 M KOH titrant will be required to reach the endpoint of a titration of 10.00 mL of 0.361 M citric acid?

Answer 1

so streangth of citric acid should be 0.1472(N) or 0.1472*3(M)=0.4434(M).