Problem: Determine the percent ionization of a 0.250M solution of benzoic acid.

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We’re being asked to calculate the percent ionization of a 0.250 M solution of benzoic acid.


Recall that the percent ionization is given by:


% ionization=[H+][HA]initial×100


We know the initial concentration of benzoic acid, 0.250 M. We just need to find the concentration of H+ at equilibrium.


Since benzoic acid has a low Ka value, it’s a weak acid. 

Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case). 


The dissociation of benzoic acid is as follows:

C6H5COOH(aq) + H2O(l)  H3O+(aq) + C6H5COO(aq); Ka = 6.3 x 10-5


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Problem Details

Determine the percent ionization of a 0.250M solution of benzoic acid.

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Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.