Is a solution made by diluting 010mole of ch3cooh ka 18 x

Question

1.  What will the pH be if 13 mL of 0.1 M NaOH are added to the buffer obtained by mixing 91 mL of 0.5 M CH₃NH₂and 91 mL of 1.0 M CH₃NH₃⁺Cl^-? (K_bfor CH₃NH₂is: 5.2 x 10^-4)

2.  Is a solution made by diluting 0.10mole of CH₃COOH (Ka = 1.8 x 10^-5) in 100 mL of H₂O a buffer?

3.  What is the pH of a solution made by diluting 0.052 moles of NH₃ (K_b = 1.8 x 10^-5) in 221 mL of water?