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Many common substances we use every day are acids or bases, and the composition or purity of these products is something we take for granted. With the Microscale Titration: Percent Acetic Acid in Vinegar—ChemTopic™ Lab Activity, analyze the percent acetic acid content in vinegar by microscale titration. Prepare a standard sodium hydroxide solution of known molarity, and use it to titrate vinegar and determine its composition.