Trichloroacetic acid (CCl3CO2H) is a corrosive acid that is used to precipitate proteins. The pH of a 0.050 M solution of trichloroacetic acid is the same as the pH of a 0.040 M HClO4 solution. Calculate Ka for trichloroacetic acid.

Question

I just don't know where to start. How can you find the Ka if all you're given is two pHs?? Even just some guidance on how to start would be great

Answer 1

HClO4 is a very strong acid, it dissociates completely.
pH= log (.04)

Answer 2

Thanks!