pH of solutions containing weak acids and weak bases

pH of solutions containing weak acids and weak bases
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1- What is the pH of a solution which is 0.021 M in weak base and 0.035 M in the conjugate weak acid (Ka = 7.1×10^-6)?

2- You have a buffer solution composed of 2.50 mol of acid and 5.25 mol of the conjugate base. If the pKa of the acid is 4.40, what is the pH of the buffer?

3- What is the pH of a buffer that has 0.140 moles HF (pKa = 3.15) and 0.071 moles in KF in 1.00 L of solution when 0.020 moles of HCl is added?