HELP! Buffer calculation

Feb 2018
The question:

You will prepare 2 buffer solutions, one which is pH 5.2 and one which is pH 8.8. Solutions available: 1M NH3, 1M NH4Cl, 1M ethanoic acid, 1M sodium ethanoate solution. Calculate how much of the above solutions you need to make 100cm3 of each buffer.

Use the equation pH = pKa - log [HA]/[A-] :eek:

Any help appreciated!