Use the HendersonHasselbalch equation to calculate the of ea

Use the Henderson-Hasselbalch equation to calculate the of each solution: Part A a solution that is 0.185 M in HC2H3O2 and 0.125 M in KC2H3O2 Express your answer using two decimal places.

Solution

Ka of HC2H3O2 = 1.8 x 10^(-5)


pH = pKa + log([KC2H3O2]/[HC2H3O2])

= -log Ka + log([KC2H3O2]/[HC2H3O2l])

= -log(1.8 x 10^(-5)) + log(0.125/0.185)

= 4.57