Problem: At a certain temperature, the percent dissociation (ionization) of chlorous acid, HClO2, in a 1.43 M solution water is 8.0%.Calculate the value of Ka for chlorous acid at this temperature.

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FREE Expert Solution

We’re being asked to calculate the equilibrium constant of HClO2 if a 1.43 M solution is 8.0 % ionized.


Recall that the percent ionization is given by:


% ionization=[H3O+][HA]initial×100


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


The dissociation of HClO2 is as follows:


HClO2(aq) + H2O(l)  H3O+(aq) + ClO2(aq)


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Problem Details

At a certain temperature, the percent dissociation (ionization) of chlorous acid, HClO2, in a 1.43 M solution water is 8.0%.

Calculate the value of Ka for chlorous acid at this temperature.