Question

calculate the acidity (H+ concentration) of a carbonated beverage that contains .15 m h2co3 use only the first ionization for h2co3 to hco3- which is 4.4x10^-7

Answer 1

                  H2CO3 -----------------> H^+ + HCO3^-

I              0.15                                   0          0

C           -x                                        +x         +x

E          0.15-x                                   +x        +x

         Ka   = [H^+][HCO3^-]/[H2CO3]

        4.4*10^-7   = x*x/0.15-x

      4.4*10^-7 *(0.15-x) = x^2

          x   = 0.000256

[H^+]   =   x    = 0.000256M >>>>answer