HClO4 → strong acid
pH = 1.398 (same pH as CCl3CO2H)
Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case).
The dissociation of CCl3CO2H is as follows:
CCl3CO2H(aq) + H2O(l) ⇌ H3O+(aq) + CCl3CO2–(aq)
Solving for [H3O+] from pH:
[H3O+] = 0.040 M
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.
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