Question

3. The following table shows the data for the titration of 25.00 mL of 0.200 M CH₃COOH (pK_a= 4.75) with 0.200 M NaOH (sodium hydroxide).

Volume of NaOH added (mL)	pH of the solution (measured)	Mols of CH3COO-formed	Mols CH3COOH remained	pH of the solution (calculated)
0.00	2.72	0	0.005	2.70
10.00	4.57	0.002	0.003	4.57
12.50	4.7	0.0025	0.0025	4.75
24.90	7.14	0.0049	2 x 10-5	7.14
24.99	8.14	0.00	2 x 10-6	8.15
25.00	8.88	0.005	0	8.88
25.01	9.60	0.05	0	9.60
25.10	10.60	0.005	0	10.60
26.00	11.59	0.0052	0	11.59
35.00	12.52	0.007	0	12.52

a. Find the pH at equivalent point

b. find the concentration of H+ ions at the equivalence point

Please show work.

Answer 1

PH at equivalence point is 8.8

Concentration of H+ is 1.32*10^-9 M