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Asked Mar 1, 2020
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When a 0.028M aqueous solution of a certain acid is prepared, the acid is 1.7% dissociated. Calculate the acid dissociation constant Ka of the acid. Round your answer to 2 significant digits.

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Expert Answer

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Step 1

The acid can be represented as HA. Acid dissociation constant of the reaction is given.

Chemistry homework question answer, step 1, image 1

 

Step 2

Initial concentration of the acid is 0.028 M. Here 1.7% of this acid gets dissociated. Amount of acid dissociated can be calculated as given.

Chemistry homework question answer, step 2, image 1

As the reaction proceeds, it attains equilibrium and hence the concentration can be determined using ICE table.

Chemistry homework question answer, step 2, image 2

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