2. Using an equimolar mixture of formic acid (Ka=1.8 x 10^-4) and sodium formate, determine the pH that this buffer solution will have.© BrainMass Inc. brainmass.com October 1, 2020, 11:29 pm ad1c9bdddf
a 2.5M solution of hydrocyanic acid has a measured pH of 4.5
calculate the Ka for hydrocyanic acid and its % dissociation.
HCN + H¬2O ↔ H3O+ + CN-
pH = - log [H3O+]
4.5 = - log [H3O+]
- 4.5 = log ...
In this exercise, students are asked to find the Ka and the % dissociation of a weak acid, given the weak acid's concentration and the pH. In the second part, students will use the Henderson-Hasselbalch equation to find the pH of a buffer solution, given the molar ratio and the Ka of the weak acid.