Calculate the concentrations of H2C2O4, HC2O4^ -, C2O4^ -2, and H^+ species in a 0.430 M...

Calculate the concentrations of H2C2O4, HC2O4^ -, C2O4^ -2, and H^+ species in a 0.430 M Oxalic Acid Solution
(Ka1 = 6.5 x 10^-2)
(Ka2 = 6.1 x 10^-5)
Be sure to answer in correct number of significant figures.

H2C2O4 = ________ M
HC2O4^- = _________ M
C2O4^2- = _________ x 10 ^ (scientific notation)
H^+ = ____________ M

Solutions

Expert Solution

suppose oxalic acid is H2A .

H2A --------------------------> H+ + HA-

0.430 0 0 -----------------> initial

0.430-x x x ----------------------> equilibrium

Ka1 = [HA-][H+]/[H2A]

6.5 x 10^-2 = x^2 / 0.430 -x

x^2 + 6.5 x 10^-2 x - 0.02795 = 0

x = 0.1378

x = [HA-] = [H+] = 0.1378 M

[H2A] = 0.430 - 0.1378 = 0.2922 M

H2C2O4 = _0.2922 M_______
HC2O4^- = __ 0.138 M_______
C2O4^2- = ____6.1 x 10 ^-5 M
H^+ = _____0.138 M___

note : Ka2 value equal to A-2 for diprotic acid

queen_honey_blossom answered 1 year ago

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