Problem: The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3x10 –5. Calculate the equilibrium concentration of C6H5COOH in the solution if the initial concentration of C6H5COOH is 0.061 M.

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FREE Expert Solution

We’re being asked to calculate the equilibrium concentration of CH3COOH when its initial concentration is 0.061 M.


To solve this problem, we need to:

Step 1. Determine the dissociation of the acid in water.

Step 2. Construct the ICE chart.

Step 3. Determine the equilibrium concentration of CH3COOH



Step 1Since CH3COOH 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 CH3COOH is as follows:

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Problem Details
The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3x10 –5. Calculate the equilibrium concentration of C6H5COOH in the solution if the initial concentration of C6H5COOH is 0.061 M.