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Calculate the equilibrium concentration of undissociated in a glycolic acid solution with an analytical glycolic acid concentration...

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Chemistry

Calculate the equilibrium concentration of undissociated in aglycolic acid solution with an analytical glycolic acidconcentration of 0.0824 and a pH of 3.180.

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3.7 Ratings (423 Votes)

pH = 3.180

[H+] = 10^-pH

         = 10^-3.108

          = 6.61 x 10^-4 M = x

glycolic acid    =   HA

HA   ------------------------> H+    +   A-

0.0824                              0             0       ---------------------> initial

-x                                     +x           + x -------------------> change

0.0824 -x                           x            x ------------------> equilibrium

0.0824 -x   = equilibirum concentration

0.0824-6.61 x 10^-4 = 0.0817 M

equilibrium concentration of undissociated in a glycolic acid solution   = 0.0817 M
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