What is the molar concentration of 4% (w/v) CH3COOH? Hence calculate the expected titre of 0.1M NaOH solution when reacting with 5.00mL if vinegar.

4% is 4 g acetic acid/(4+ 96H2O).

4 g = 4/60 moles = 0.0667 and that in 0.096 L = 0.667 moles/L.