If given a pH of 2.57, how do you find the pKa?

1 Answer
anor277
Jan 30, 2016

You can find #[H_3O^+]#, but you cannot find #pK_a# with the given information.

Explanation:

If #pH# #=# #2.57#, then (by definition), #[H_3O^+]# #=# #10^(-2.57)# #mol*L^-1#. We have no handle on the concentration of the acid that gave rise to this concentration of hydronium ion.

Related questions
See all questions in pH, pKa, Ka, pKb, Kb
Impact of this question
2439 views around the world
You can reuse this answer
Creative Commons License