A 30.0-mL sample of 0.165 M propanoic acid is titrated with 0.300 M KOH. Calculate the pH at each volume of added base: one-half equivalence point.

Video transcript

Hi everyone here we have a question asking at the half equivalence point, what is the ph of the tip tray shin of 20 mL of 0.178 moller lactic acid with 0. molar sodium hydroxide. Because this is a weak acid, strong based filtration. The ph at one half the equivalence point is the P. K. A. Of the weak acid. The K. A. Equals 1. Times 10 to the -4. The ph equals the P. K. A. Equals the negative log. Okay A equals the negative log of 1.38 Times to the negative 4th Equals 3.860. And that is our final answer. Thank you for watching. Bye.