Asked by Ronne
Need help with HW question.
You have an 11 mM acetate buffer at pH 3.76. What is the concentration (mM) of the acetate ion? Acetic acid has a pKa of 4.76.
I used the Henderson Hasselbach eq. by the difference btw the ph and pka and then the conc. of HA and A-. then with a little algebra, I got the answer
as 0.01 or 1x10^-2
is this the right way to solve.
Thanks
You have an 11 mM acetate buffer at pH 3.76. What is the concentration (mM) of the acetate ion? Acetic acid has a pKa of 4.76.
I used the Henderson Hasselbach eq. by the difference btw the ph and pka and then the conc. of HA and A-. then with a little algebra, I got the answer
as 0.01 or 1x10^-2
is this the right way to solve.
Thanks
Answers
Answered by
DrBob222
As far as it goes yes but to get acetate you need to solve two simultaneous equations.
equation one is pH = pKa + (base/acid)
Plug in pH and pKa and solve for (b/a).
For equation two it is
(acid) + (base) = 11
Solve for acid and base.
equation one is pH = pKa + (base/acid)
Plug in pH and pKa and solve for (b/a).
For equation two it is
(acid) + (base) = 11
Solve for acid and base.
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