Asked by anon
You measure the pH of a 0.50 M unknown acid solution using a pH meter and it is found to be 1.74. What
is Ka for the acid?
I know ph=-log{H+}
Where do I go from here?
is Ka for the acid?
I know ph=-log{H+}
Where do I go from here?
Answers
Answered by
DrBob222
Do you know it is a weak acid?
.......HA ==> H^+ + A^-
I....,0.5.....0.....0
C......-x.....x.....x
E.....0.5-x...x.....x
You know pH so you know x = (H^+) and A^-. Plug these into the Ka xpression and solve for Ka after evaluating 0.5-x.
.......HA ==> H^+ + A^-
I....,0.5.....0.....0
C......-x.....x.....x
E.....0.5-x...x.....x
You know pH so you know x = (H^+) and A^-. Plug these into the Ka xpression and solve for Ka after evaluating 0.5-x.
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