Problem: Find the [H3O+] concentration of a 0.289 M formic acid solution. (The value of Ka for formic acid is 1.8×10-4) 

FREE Expert Solution

We’re being asked to calculate pH of of a 0.289 M formic acid solution.


Since HA 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 HA is as follows:

HCOOH(aq) + H2O(l)  H3O+(aq) + HCOO(aq); Ka = 1.8×10-4


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Problem Details

Find the [H3O+] concentration of a 0.289 M formic acid solution. (The value of Ka for formic acid is 1.8×10-4

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