titration and ph

I’m stuck on a Chemistry question and need an explanation.

1- If 21.57 mL of 0.01114 M HNO₃ are titrated with 0.01368 M KOH, then what is the pH after the addition of 23.43 mL of KOH?

2- If 21.23 mL of a 0.1071 M solution of HNO₃ are titrated with 0.1619 M solution of KOH, how many mL of KOH are required to reach a pH = 7.00?

3- What is the pH of 38.94 mL of a 0.1395 M solution of a weak monoprotic acid (HA, K_a = 1.88 x 10^-4) @ the midway point of a titration with 0.1704 M NaOH?

4- What is the pH of 13.75 mL of a 0.1766 M solution of a weak monoprotic acid (HA, K_a = 1.12 x 10^-6) prior to its titration with 0.1039 M Sr(OH)₂?

5- What is the pH of 31.82 mL of a 0.1215 M solution of a weak monoprotic acid (HA, K_a = 4.32 x 10^-6) that has been titrated with 35.42 mL of 0.1988 M CsOH?

6-What is the pH of 30.75 mL of a 0.1134 M solution of a weak monoprotic acid (HA, K_a = 2.66 x 10^-7) that has been titrated with 8.53 mL of 0.1548 M LiOH?

7- What is the pH at the midway point of the titration of 60.00 mL of a 0.03750 M solution of HCl with 0.1050 M LiOH.

8- What is the pH of a 29.00 mL solution of a 0.1956 M weak monobasic base (B:, K_b = 7.13 x 10^-8) after it has been titrated with 25.00 mL of 0.2269 M HNO₃?

9- What is the pH at the midway point of the titration of 62.00 mL of a 0.04250 M solution of KOH with 0.1100 M HI.

10- What is the pH of 34.71 mL of a 0.2605 M solution of a weak monobasic base (B:, K_b = 7.98 x 10^-6) prior to its titration with 0.1111 M HClO₃?

11- What is the pH of 31.56 mL of a 0.1528 M solution of a weak monoprotic basic base (B:, K_b = 2.41 x 10^-6) @ the midway point of a titration with 0.1236 M HClO₃?

12- What is the pH of 37.88 mL of a 0.1142 M solution of a weak basic base (B:, K_b = 7.95 x 10^-4) that has been titrated with 18.45 mL of 0.1831 M HI?

13- What is the pH of 30.29 mL of a 0.1103 M solution of a weak basic base (B:, K_b = 1.81 x 10^-6) that has been titrated with 35.87 mL of 0.1707 M HI?

14- What is the pH at the start of the titration of 14.71 mL of 0.001355 M LiOH with 0.01091 M HClO₄?

15- If 21.65 mL of 0.1121 M RbOH are titrated with 0.1367 M HClO₃, then what is the pH after the addition of 23.19 mL of HClO₃?