a) the ionization constant Ka of formic acid ,HCO2H is 1.80 *10^-4. What is the percent ionization of a 0.00100 M solution of this acid?
b)The pH of a 0.072 M solution of benzoic acid HC7H5O2 is 2.86.compute Ka for this acid?
c)What concentration of acetic acid HCH3CO2 is needed to give a [H+]=3.5 *10^-4? Ka = 1.75 *10^-5
For the a) i'm not sure but :
HCO2H ----> HCO2- + H+
% ionization =HCO2H/H+ *100%
Ka = [HCO2-][H+]/[HCO2H]
1.8*10^-4 = (x)(x)/0.417M
x^2=(1.8*10^-4)(0.417)
x=8.6*10^-3
% ionization= 1.80*10 ^-4/8.6*10^-3 *100%
% ionization = 2.09%
am i on the right truck?