Question

Part A

Calculate the pH and the concentrations of all species present in 0.16 M H2SO3. (Ka1 = 1.5×10−2, Ka2 = 6.3×10−8)

Express your answer to three significant figures and include the appropriate units.

pH =

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Part B

Calculate the concentration of H2SO3 in solution.

Express your answer to two significant figures and include the appropriate units.

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Part C

Calculate the concentration of HSO−3 in solution.

Express your answer to two significant figures and include the appropriate units.

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Part D

Calculate the concentration of H3O+ in solution.

Express your answer to two significant figures and include the appropriate units.

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Part E

Calculate the concentration of SO2−3 in solution.

Express your answer to two significant figures and include the appropriate units.

Answer 1

part A)

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

0.16                                            0         0

0.16-x                                           x         x

Ka1 = x^2 / 0.16- x = 1.5 x 10^-2

x^2 + 1.5 x 10^-2 x - 2.4 x 10^-3 = 0

x = 0.0421

pH = -log [H3O+]

pH    = -log (0.0421)

pH = 1.38

part B)

[H2SO3] = 0.12 M

partC )

[ HSO3- ] = 0.042 M

part D)

[ H3O+ ] = 0.042 M

part E)

SO3-2 = Ka2

[ SO3-2 ] = 6.3×10^−8