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

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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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concentration of oxalic acid =0.0330 M

pKa1 = 1.23

Ka = 10^-pKa = 0.0589

HOOCCOOHÂ Â ---------------------> H + HOOCCOO-

Â Â 0.0330Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â 0

0.0330 - xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â 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)

Â Â Â Â Â = 1.62

pH = 1.62

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

Free

80.2K

Verified Solution

Question

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?

Answer & Explanation Solved by verified expert

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