Neutralizing Excess Hydrochloric Acid

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Acid/Base Back-Titration as a means of Determining the Effectiveness of an Antacid Valencia Waller Chemistry 110, Section 004 October 19, 2015 Professor Mauro Tiso Lab Partners: Laura Wilson & Brady Hill ABSTRACT The purpose of this experiment was to determine which antacid, Rite Aid Max or Alka-Seltzer Original, was the most effective in neutralizing excess hydrochloric acid (HCl) in the stomach. To begin, 10 mL of Rite Aid Max and 1 tablet (2.9g) of Alka-Selzer were added to separate 250 mL Erlenmeyer flasks, each containing a mixture of 75 mL of distilled water, 3 drops of the pH indicator phenolphthalein, and 25 mL of HCl. The antacids reacted with the HCl, but not enough to fully neutralize it. Through a process of acid/base back-titration, the excess acid was made to react with a known concentration of a base standardized solution of sodium hydroxide (NaOH) until the equivalence point, the point at which the number of moles of NaOH added to the solution equaled the number of moles of HCl, was reached.…show more content…
These data suggest that the Alka-Seltzer is more effective in neutralizing excess HCl than Rite Aid Max, as it neutralized a greater amount of HCl before the NaOH solution was added in order to complete the reaction and even more, it would make sense that the more an antacid reacts with HCl to neutralize it, the less NaOH that is needed to fully neutralize the

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