Exploring the degree of ionization equation in Study Question 127: Calculate the degree of ionization, , for

Exploring the degree of ionization equation in Study Question 127: Calculate the degree of ionization, α, for formic acid at the following concentrations: 0.0100 M, 0.0200 M, 0.0400 M, 0.100 M, 0.200 M, 0.400 M, 1.00 M, 2.00 M, and 4.00 M.
(a) Plot the results of the calculation as α versus formic acid concentration. Is there a linear relationship? If not, try plotting the logarithm of Co versus α.
(b) What can you conclude about the relationship of the degree of ionization and the initial acid or base concentration?

Data given in Question 127

Chemists often refer to the degree of ionization of a weak acid or base and give it the symbol α. The equilibrium constant in terms of α and Co, the initial acid or base concentration, is given by the useful equation

As an example, the degree of ionization for 0.010 M acetic acid is 0.0103.

Transcribed Image Text:

K = a²Co (1-a)