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Chemists often have to answer how much of something is present in a sample. If the sample contains an acid or base, this is usually answered by acid–base titration to measure the concentration of an acid or base in solution and calculate the formula (molar) mass of an unknown acid or base. With the Classic Titration: pH Curves and an Unknown—ChemTopic™ Lab Activity, analyze the shape of the titration curve for neutralization of hydrochloric acid with sodium hydroxide and determine the concentration of an unknown hydrochloric acid solution.