7. What is the pH of a solution of 0.200M H3C6H5O7 (citric acid)? Ka = 3.5 x 10-4

Ionization equilibrium: H3C6H5O7 (aq) H+ (aq) + H2C6H 5O7- (aq)

I.C.E. table:

H3C6H5O7 (aq) H+ (aq) H2C6H5O7- (aq)
INTIAL
0.200M
0M
0M
CHANGE
-xM
+xM
+xM
EQUILIBRIUM

What are the equilibrium concentrations of each species?

a) 0.200M, xM, (0.200-x)M
b) 0M, 0.200M, 0.200M
c) (0.200-x)M, xM, (0.200+x)M
d) (0.200-x)M, xM, xM