If you had a 0.10 M solution of acetic acid (Ka=1.8X10-5), Citric acid (Ka=1.4X10-4), Lactic acid (Ka=8.7X10-4) and Oxalic acid (Ka=5.9X10-2), Which solution of acid would produce a buffer with the lowest pH? Which solution would be the radio of conjugate base to conjugate acid for a solution of citric acid if the pH of the solution was 3? Would such a solution act as a buffer?