Calculate the concentration of formate in a 100mm solution of formic acid at ph 4.15. the pka for formic acid is 3.75

The molarity of formic acid is 100 mM or . The dissociation reaction of formic acid is as follows:

The expression for dissociation constant of the reaction will be:

Rearranging,

Here, pH of solution is 4.15 thus, concentration of hydrogen ion will be:

Similarly, thus,

Putting the values,

Therefore, the concentration of formate will be 0.2511 M.

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