Determine the pH when the following amounts of titrant is added in the following titration : Titration of 75.0 mL of 0.2

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Determine the pH when the following amounts of titrant is added in the following titration : Titration of 75.0 mL of 0.20M methylamine (kb= 4.4x10^-4) with 0.25 M
HCI.
1. What is the pH of the solution at the initial point of 0.00 mL acid titrant
2. What is the pH of the solution after addition of 10.00 mL titrant.
3. What is the pH of the solution after addition of 30.00 mL titrant.
4. What is the pH of the solution after addition of 60.00 mL titrant.
5. What is the pH of the solution after addition of 61.00 mL titrant.