Question

11. Consider the titration curve shown below for the titration of a weak diprotic acid (HX2) with a strong base and answer each question. Titration curve of a weak diprotic acid with a strong base pH 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 Volume of base added (mL) a) What is the formula of the acid at 15.00 mL of base added? b) At what volume of added base is the pH calculated by working an equilibrium problem based on the initial concentration and Ka of the weak acid (H2X)? c) At what volume of added base dose pH = pKa of HX-? d) Beyond what volume of added base is the pH calculated by focusing on the amount of excess strong base? e) Write the net ionic equation for the neutralization occurring between 15.00 mL and 30.00 mL. Net equation:

          11. Consider the titration curve shown below for the titration of a weak diprotic acid (HX2) with a strong base and answer each question.

Titration curve of a weak diprotic acid with a strong base

pH
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00
Volume of base added (mL)

a) What is the formula of the acid at 15.00 mL of base added?
b) At what volume of added base is the pH calculated by working an equilibrium problem based on the initial concentration and Ka of the weak acid (H2X)?
c) At what volume of added base dose pH = pKa of HX-?
d) Beyond what volume of added base is the pH calculated by focusing on the amount of excess strong base?
e) Write the net ionic equation for the neutralization occurring between 15.00 mL and 30.00 mL. Net equation:

11. Consider the titration curve shown below for the titration of a weak diprotic acid (HX2) with a strong base and answer each question.

Titration curve of a weak diprotic acid with a strong base

pH
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00
Volume of base added (mL)

a) What is the formula of the acid at 15.00 mL of base added?
b) At what volume of added base is the pH calculated by working an equilibrium problem based on the initial concentration and Ka of the weak acid (H2X)?
c) At what volume of added base dose pH = pKa of HX-?
d) Beyond what volume of added base is the pH calculated by focusing on the amount of excess strong base?
e) Write the net ionic equation for the neutralization occurring between 15.00 mL and 30.00 mL. Net equation:

Added by Melissa G.

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