Investigating an Acid Mixture

An interesting and challenging problem for AP Chemistry students is the investigation of a mixture. We have a great chemistry experiment available in which the student analyzes a mixture of hydrochloric acid and phosphoric acid. This lab presents the student with the task of conducting a seemingly routine acid-base titration.

However, the student must analyze the titration data to determine how much HCl and how much H₃PO₄ were mixed. As an added bonus, the student will determine the Ka₂ of H₃PO₄.

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