A 25.00mL sample of vinegar is diluted with water to a final volume of 250.0mL. A 25.00mL portion of the diluted vinegar is then titrated with 0.0998 M NaOH. If 22.43mL of NaOH is needed to reach the equivalence point, what is the original concentration of acetic acid in the vinegar?
CH3CO2H(aq) +OH-(aq) ?CH3CO2-(aq) +H2O