student measures that it takes 7.21mL of 0.326 M NaOH (aq) solution to reach the first equivalence point of a titration of 100.0 mL of phosphoric acid solution. He also notes that it takes a total of 14.40 mL of 0.326 M NaOH (aq) solution to reach the second equivalence point. What is the concentration of the phosphoric acid solution?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.