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The leaves of the rhubarb plant contain high concentration of diprotic oxalic acid (HOOCCOOH) and must...

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Chemistry

The leaves of the rhubarb plant contain high concentration ofdiprotic oxalic acid (HOOCCOOH) and must be removed before thestems are used to make the rhubarb pie. If pKa1=1.23 and pKa2=4.19,what is the pH of a 0.0330 M solution of oxalic acid?

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4.4 Ratings (611 Votes)

concentration of oxalic acid =0.0330 M

pKa1 = 1.23

Ka = 10^-pKa = 0.0589

HOOCCOOH   ---------------------> H + HOOCCOO-

   0.0330                                         0             0

0.0330 - x                                      x               x

Ka1 = x^2 / 0.0330 - x

0.0589 = x^2 / 0.0330 - x

x = 0.024

[H+] = 0.024 M

pH = -log[H+] = -log (0.024)

      = 1.62

pH = 1.62
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