A very old and tired , grey haired AP Chem instructor wanted todetermine the Ka of an unlabelled monoprotic acid in hisstockroom. He dissolved an unknown amount of acid in an unknownamount of water and proceeded to titrate the sample with a solutionof NaOH of unknown molarity. After adding 10.0 ml of NaOH, heuttered that famous first order expletive “Oh, Michigan State”. Hestopped and measured the pH of the solution at that point and foundpH= 5.0. He continued to add NaOH until he realized he didn’t addphenolphthalein to the solution. He added 3 drops and the solutionturned dark pink. Now he was really irritated and dropped an “Oh,Ohio State” on the situation. At this point he had added 34.68 mlof NaOH. He thought for a moment and then carefully began to addthe unknown acid back to the titration mixture. He added back 2.62ml of the unknown acid which caused the solution to becomecolorless. Can our intrepid hero calculate the Ka ? Hint: he can. So calculate the Ka Show all of your work.
this is due tomorrow morning so i'd reaaly apperciate an answernow
