Experiment#4

# Experiment#4 - 3.65 RESULTS AND CALCULATIONS : Part B Mean(...

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TITLE: Acid/Base Titrations PURPOSE: The purposes of this exercise was to determine the quantity of citric acid in a commercially available beverage employing techniques of dilution and standardization of a base (NaOH), as well as the titration of NaOH into citric acid to determine the concentration of the acid. PROCEDURE: The procedure was followed as indicated in the handout for experiment four. DATA AND OBSERVATIONS: Part B The militers of NaOH needed to neutralize the HCl in the titration was recorded and repeated 3 times (see Table 1). The average militers was calculated (see Table 1)and used to calculate the molarity of NaOH. Table 1. Equivalence Point of a NaOH and HCl titration (mL) V 1 11.0 V 2 10.9 V 3 10.8 μ 10.9 Part C The militers of NaOH needed to neutralize the nitric acid in the titration was recorded and repeated 4 times (see Table 1). The average militers was calculated (see Table 1) and used to calculate the molarity of citric acid. Table 1. Equivalence Point of a NaOH and citric acid titration (mL)

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V 1 3.7 V 2 3.7 V 3 3.6 V 4 3.6
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Unformatted text preview: 3.65 RESULTS AND CALCULATIONS : Part B Mean( ) of NaOH = sum of resultsnumber of results = ( . + . + . ) 11 00mL 10 9mL 10 8mL 3 = . 32 73 = 10.9mL Standard Deviation (s) of NaOH X-N-12 =s ( . -. ) +( . 11 0 10 9 2 10 9-. ) +( . 10 9 2 10 9-. ) 10 9 23-1 =s (. + +. 01 0 012 =s . 022 =s . 01 = s s = 0.1 Molarity of NaOH M 1 V 1 = M 2 V 2 M NaOH V NaOH = M HCl V HCl M NaOH 10.9mL = . 0 100mol HClL l 10.0mL HCl M NaOH 10.9mL = 1.00 M NaOH = . . 1 0010 9 M NaOH = 0.0917 molL Part C Mean( ) of NaOH = . 3 65mL Standard Deviation (s) of NaOH s = . 0 05 Molarity of Citric Acid M NaOH V NaOH = M citric acid V citric acid M citric acid =0.0167 molL 3(3mol NaOH: 1 mol of citric acid) M citric acid = 0.00557 molL M citric acid =0.00557 . molL 192 12 g citric acid1 mol citric = . acid 1L1000mL 1000mg1g 1 07mgml Discussion and Conclusion: State results Results might be skewed due to the fact that we might have waited Error; .0917/.1 x100 Way to better...
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## This note was uploaded on 06/10/2008 for the course CHEM 01 taught by Professor Kryatov during the Spring '07 term at Tufts.

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Experiment#4 - 3.65 RESULTS AND CALCULATIONS : Part B Mean(...

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