In addition to the acid-dissociation constant, K a , another measure of the stre

Question

In addition to the acid-dissociation constant, Ka, another measure of the strength of an acid is percent ionization, determined by the following formula:

Percent ionization=[HA] ionized[HA] initial

A certain weak acid, HA, has a Ka value of 2.8 Times 10-7 Calculate the percent ionization of HA in a 0.10 M solution. Express your answer to two significant figures and include the appropriate units. Calculate the percent ionization of Ha in a 0.010 M solution. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

ionisation = square root of (Ka/C)

                                         = square root of (2.8*10^-7/0.1)

                                         = 1.67*10^-3

% of ionisation = 1.67*10^-3 *100 = 1.67*10^-1 %

2)

ionisation = square root of (Ka/C)

                                         = square root of (2.8*10^-7/0.01)

                                      = 0.53*10^-2

% of ionisation = 0.53 %

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