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7 solutions

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

Titrations of Diprotic and Polyprotic Acids

Q. 0.405 g of an unknown triprotic acid are used to make a 100.00 mL solution. Then 25.00 mL of this solution is transferred to an Erlenmeyer flask and is titrated with 0.1041 M NaOH. The initial burette reading is 1.87 mL; when the titration endpoint is reached, the final burette reading is 36.71 mL. How many moles of triprotic acid are neutralized during the titration? Provide your answer in decimal form (e.g. 0.123) to the correct number of significant figures.

Solved • Oct 30, 2019

Titrations of Diprotic and Polyprotic Acids

Q. What is the molar mass of H2X if 29.45 mL of 0.187M NaOH is required to neutralize a solution by adding 0.242 g of H2X to enough water to make 25.00 mL of solution.

Solved • Jun 9, 2019

Titrations of Diprotic and Polyprotic Acids

Q. The pkb values for the dibasic base B are pKb1=2.10 and pkb2=7.62. Calculate the pH at each of the end points in the titration of 50.00 mL of 0.55 M B(aq) solution with 0.55 M HCl (aq).

Solved • Apr 7, 2019

Titrations of Diprotic and Polyprotic Acids

Q. Calculate the pH for each of the given points in the titration of 50.0 mL of 1.8 M H3PO4(aq) with 1.8 M KOH(aq).

Solved • Apr 7, 2019