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

Ionization equilibrium: H3C6H5O7 (aq) H+ (aq) + H2C6H5O7- (aq)

Now we must identify the INITIAL concentrations, determine the change in concentration and find the equilibrium concentrations of each species. We do this with an I.C.E. table:

H3C6H5O7 (aq) H+ (aq) H2C6H5O7- (aq)
INITIAL
CHANGE
EQUILIBRIUM

What are the initial concentrations of each species?

a) 0.200M, 0M, 0.200M
b) 0M, 0.200M, 0.200M
c) 0.200M, 0M, 0M
d) 0.200M, 0.200M, 0.200M