chemistry ???

Question

You transferred 20. mL of acetic acid solution to an Erlenmeyer flask and added 2 drops of phenolphthalein solution. You filled your buret with 0.10 M NaOH so that the initial buret reading was 2.69 mL. After titrating your sample to the faint-pink phenolphthalein endpoint, the final buret reading was 17.19 mL.

1) How many moles of NaOH were delivered to the flask?

2)What is the concentration of the acetic acid solution?

Answer 1

1)
(17.19mL - 2.69mL)*0.10M = 1.45 mMole

2)
1.45 mMole/20.mL = 0.073M