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11 solutions

Titrations of Diprotic and Polyprotic Acids

Q. You are given a 1.00 g sample of an unknown tri-protic acid, which you dissolved in 50.0 mL of water containing phenolphthalein indicator. You titrate the acid solution with standardized 0.400 M KOH(aq). It requires 39.06 mL of the KOH solution to produce a light pink indicator color. What is the molecular weight of the unknown acid?

Solved • Dec 31, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A student was given a 0.15 M solution of an unknown diprotic acid H2A and asked to determine the Ka1 and Ka2 values for the diprotic acid. The student titrated 44.4 mL of the 0.15 M H2A with 0.15 M KOH. After 22.2 mL of KOH was added, the pH of the resulting solution was 6.37. After 44.4 mL of KOH was added, the pH of the resulting solution was 8.34. What is the value of ka2 for the diprotic acid when ka1 is 4.2e-7?

Solved • Dec 7, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A student was given a 0.15 M solution of an unknown diprotic acid H2A and asked to determine the Ka1 and Ka2 values for the diprotic acid. The student titrated 44.4 mL of the 0.15 M H2A with 0.15 M KOH. After 22.2 mL of KOH was added, the pH of the resulting solution was 6.37. After 44.4 mL of KOH was added, the pH of the resulting solution was 8.34. What is the value of Ka2 for the diprotic acid when ka1 is 4.2e-7?

Solved • Dec 8, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A student was given a 0.15 M solution of an unknown diprotic acid H2A and asked to determine the Ka1 and Ka2 values for the diprotic acid. The student titrated 51.4 mL of the 0.15 M H2A with 0.15 M NaOH. After 25.7 mL of NaOH was added, the pH of the resulting solution was 1.82. After 51.4 mL of NaOH was added, the pH of the resulting solution was 4.41. What are the values of Ka2 for the diprotic acid?

Solved • Dec 8, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A student was given a 0.11 M solution of an unknown diprotic acid H2A and asked to determine the Ka1 and Ka2 values for the diprotic acid. The student titrated 44.6 mL of the 0.11 M H2A with 0.11 M KOH. After 22.3 mL of KOH was added, the pH of the resulting solution was 1.19. After 44.6 mL of KOH was added, the pH of the resulting solution was 2.70. What are the values of Ka1 and Ka2 for the diprotic acid?

Solved • Dec 3, 2019

Titrations of Diprotic and Polyprotic Acids

Q. 0.5008 g of an unknown triprotic acid, H3A, is dissolved in 47.3 ml of water and then titrated with 0.315 M NAOH. It takes 25.72 ml of the NaOH solution to completely neutralize the acid. What is the molecular weight (molar mass) of this acid?

Solved • Nov 11, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A titration of 200.00 mL of 1.00 M H2A was done with 1.28 M NaOH. For the diprotic acid H2A, Ka1 = 2.5x10^-5, ka2=3.1x10^-9. Calculate the pH after 100 mL of 1.28 M NaOH have been added.

Solved • Nov 4, 2019