Chem helpppp im stuck?

A solution is 0.54 M HF and 1.05 M KF. Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution of HF and KF, and calculate the pH after 0.22 mol of HCl is added to 1.00 L of the solution of HF and KF.