Question

Oxalic acid (HOOC-COOH) is a simple diprotic acid. It is used commercially in bleaching straw and leather and removing rust and ink stains.

a. Write each dissociation step for the acid including the K values from appendix C.

b. What are the equilibrium concentrations of [H2C2O4], [HC2O4- ], and [C2O42- ] in a 0.150M H2C2O4 solution. (Hint: the concentrations of [H2C2O4], [HC2O4- ] are found together and used to find concentration of [C2O42- ].)

c. What is the pH of a 0.150M H2C2O4 solution using Ka values from appendix C in your textbook.

Apendix C Values:

a: Ka1= 5.6 x 10^-2

Ka2= 5.4 x 10^-5

Answer 1

Lax Kai , 5.6 x1 02 Ka 5 O2 、+ Htー、 Ka. 5.yx10s Cb) ka O.I5D (х-у) (0.150-) ニ5.yx1 YZ〈X, Hente revised egua 10 n , Ko

uiibrium Cocntrasons are: 2 O r 2. 1.17