Question

Calculate the concentrations of H2C2O4, HC2O4−, C2O42−, and H+ species in a 0.270 M oxalic acid solution (Ka1 = 6.5 × 10−2, Ka2 = 6.1 × 10−5). Be sure to report your answers to the correct number of significant figures. please give details and formulas,

Answer 1

H2C2O4   ----------------> HC2O4-   + H+

0.270                                   0            0

0.270 - x                             x               x

Ka1 = x^2 / 0.270 - x

6.5 x 10^-2 = x^2 / 0.270 - x

x = 0.1039

[H+] = 0.104 M

[HC2O4-] = 0.104 M

[H2C2O4 ] = 0.166 M

[C2O42-] = 6.1 x 10^-5 M