Thursday
July 24, 2014

Homework Help: AP Chemistry

Posted by Sarah on Sunday, February 24, 2013 at 2:42pm.

A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown molarity. After adding 10.0 ml of NaOH, he uttered that famous first order expletive “Oh, Michigan State”. He stopped and measured the pH of the solution at that point and found pH= 5.0. He continued to add NaOH until he realized he didn’t add phenolphthalein to the solution. He added 3 drops and the solution remained colorless. He continued the titration and found the equivalence point to be 32.22 ml of the NaOH solution. Can our intrepid hero calculate the Ka? Hint: he can. So calculate the Ka. Show all of your work.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - A very old and tired , grey haired AP Chem instructor wanted to ...
Chemistry - A very old and tired , grey haired AP Chem instructor wanted to ...
AP Chemistry - There is an unknown amount of unlabelled monoprotic acid in an ...
chemistry - A 125.0 mg sample of an unknown, monoprotic acid was dissolved in ...
Chemistry - A 0.5224g sample of an unknown monoprotic acid was titrated with 0....
Chemistry - A 0.125-g sample of monoprotic acid of unknown molar mass is ...
Chemistry (College) URGENT - 1.6g of an unknown monoprotic acid (HA) required 5....
chemistry - Suppose that 0.483 g of an unknown monoprotic weak acid, HA, is ...
Chemistry - A .288 g sample of an unknown monoprotic organic acid is dissolved ...
Chemistry - At 20 degree celsius, Ka for an unknown monoprotic weak acid is 0....

Search
Members