Question

Calculate the concentration of all species in a 0.490 M solution of H2SO3. The acid ionization constants for the acid are Ka1=1.6×10−2 and Ka2=6.4×10−8. Express your answer using two significant figures. Enter your answers numerically separated by commas. [H2SO3], [HSO−3], [SO2−3], [H3O+], [OH−] =

Answer 1

H2SO3 concentration = 0.490 M

H2SO3 ----------------> HSO3-   +   H+

0.490                                  0           0

0.490 - x                             x           x

Ka1 = x^2 / 0.490 - x

1.6×10^−2 = x^2 / 0.490 - x

x = 0.0809

[H3O+] = 0.081 M

[HSO3-] = 0.081 M

[H2SO3] = 0.41 M

[OH-] = 1.2 x 10^-13 M

[SO32-] = 6.4 x 10^-8 M