posted by neee .
buffer calculate the ph of the .1m propanoic acid Ka 1.35e-5
You can't get away with no caps in chemistry even though it makes it easier to type. The problem is that m means molality; M means molarity and the two are not the same. Do you have 0.1M or 0.1m solution? Second point I want to make. Neither 0.1m nor 0.1M are buffer solutions. Is this a buffer or not? If a buffer you don't have enough information to solve the problem EVEN if you distinguish between m and M.