Chemistry Question: Rice Vinegar vs. Household Vinegar?
What is the percent by mass of acetic acid higher in household vinegar than in rice vinegar?
Answer:
Sodium hydroxide neutralizes the acetic acid in vinegar as per the following equation:
NaOH + CH3COOH = CH3COONa + H2O
If the volume of NaOH required to neutralize a sample of household vinegar is greater than that required to neutralize the same sample size of rice vinegar then the household vinegar has more acetic acid in it.
Typically a household vinegar will have a 5% acetic acid concentration compared to a 4% concentration for rice vinegar.
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