Percent Acetic Acid in Vnegar Lab

In this lab, we standardized a solution of NaOH with potassium hydrogen phthalate in a titration to determine the molarity of NaOH solution. We then used this standard NaOH solution to determine the % acetic acid in commercial vinegar.

Here were the steps to the titration.\

http://www.sparknotes.com/chemistry/acidsbases/titrations/section1.rhtml

1. Put on splash proof safety glasses
2. drain buret into the waste beaker
3. rinse your buret with a small amount of NaOH
4. with the valve closed, add NaOH until it is above the zero mark
5. Obtain 0.5-0.8 g of KHP
6. transfer KHO into Erlenmeyer flask
7. add 75ml of water to flask
8. add 2-3 drops of Phenolphthalein
9. open vial with blue cap
10. pipet 10ml of vinegar into flask
11. drain buret, fill with distilled water