Calculate the pH of a solution containing 0.0334 M potassium hydrogen fumarate and 0.021 M dipotassium fumarate. The Ka values for fumaric acid are 9.50 × 10-4 (Ka1) and 3.30 × 10-5 (Ka2).
To do the calculations we have to consider the second ionization reaction as Potassium Hydrogen fumerate is formed due to the ionization of the 1st proton.
pKa2 = -logKa2 = -log (3.30 *10^-5) = 4.48
pH = pKa2 + log [dipotassium fumarate/Potassium hydrogen fumerate]
= 4.48 + log [0.021/0.0334]
=4.28
Calculate the pH of a solution containing 0.0334 M potassium hydrogen fumarate and 0.021 M dipotassium...
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