A student wanted to determine the molar concentration of acetic acid in a commercial vinegar sample. He used a volumetric pipet to deliver 3.00 mL of vinegar to an Erlenmeyer flask, added about 30 mL of water and 3 drops of phenolphthalein indicator. He performed the titration and obtained the following data:
Flask ; Initial Volume (0.0997 M NaOH) mL ; Final Volume (0.0997 M NaOH) mL
1 ; 50.00 ; 25.10
2 ; 25.10 ; 0.35
3 ; 50.00 ; 25.00
a. Determine the molarity of acetic acid in the vinegar sample.
This is what I have (And I think it's right?!) :
mean value of NaOH = 24.88ml
moles of CH3COOH = (24.88)(0.0997) = 2.48
b. Convert molar concentration to % Acetic acid