LAB - Name Steve McPherson Partner Lindsey Maynard Paired Group Liza Menker Jose Mendez Introduction This laboratory experiment is designed to help

LAB - Name Steve McPherson Partner Lindsey Maynard Paired...

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Name: Steve McPherson Partner: Lindsey Maynard Paired Group: Liza Menker, Jose Mendez Introduction This laboratory experiment is designed to help students learn about and investigate acid base titrations. Students also learned about monoprotic and polyprotic acids, utilizing a triprotic acid for the titration. The students learned two methods for carefully titrating an acid, utilizing an indicator dye first then learning the basics of the pH scale in order to complete the second titration, monitored by a pH electrode. Finally the original concentration of citric acid can be determined through the concentration of NaOH and the volume of base that reacted. The concentration of an acid in solution can be determined by two different methods that each involve reacting the acid with a base of known concentration in order to extrapolate the acid concentration from the carefully observed titration reaction. Though the methods for titrating the acid in this experiment differ the basic chemical reaction does not differ: 1. C 6 H 8 O 7 ( aq ) + 3 NaOH ( aq ) = ¿ 3 H 2 O ( l ) + Na 3 C 6 H 5 O 7 ( aq ) 2. H 3 C 6 H 5 O 7 ( aq ) + 3 NaOH ( aq ) = ¿ 3 H 2 O ( l ) + Na 3 C 6 H 5 O 7 ( aq ) ¿ ( aq ) = ¿ 3 H 2 O ( l ) + ¿ ( aq ) + 3 OH ¿ 3.3 H ¿ The NaOH in solution titrates the citric acid to form water and an aqueous salt sodium citrate (equation 1). When the solution reaches its equivalence point the reaction has completed and the acid is
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