Honors+Acid-Base+Experiment

Honors+Acid-Base+Experiment - CHEM 1310 HONORS Dr. Charlie...

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CHEM 1310 HONORS Dr. Charlie Cox Citric Acid Analysis and Buffers Proposal Due: 12 October 2009 Objectives : 1. Develop a procedure to determine the molarity and weight percent of citric acid in Sprite ® 2. Design two methods for creating a buffering system using citric acid. 3. Evaluate the buffering capacity of the citric acid buffer. Part I: Citric Acid in Sprite First, design an experiment that will dilute an approximate 2.5 M solution of sodium hydroxide to a 0.04 M. Next, design an experiment which will help calculate the exact molarity of the NaOH using a known amount of potassium hydrogen phthalate (KHP). The standardization should be completed twice and an average should be computed. After standardizing the sodium hydroxide, conduct an experiment to find the concentration and weight percent of citric acic in an uncarbonated soda. If titrating at any point, indicate which solution is in the buret and note that phenolphthalein is available for use. The titration should be completed in triplicate. A mean and standardization deviation should be computed for the molarity and weight percentage. Standardization Data Trial 1 Trial 2 Mass of KHP ______________________ _______________________ Volume of NaOH to neutralize ______________________ _______________________ Molarity of NaOH ______________________ _______________________ Supporting Calculations:
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Dr. Charlie Cox Titration Data Trial 1 Trial 2 Trial 3 Volume of Soda ________ mL ________ mL ________ mL Volume of NaOH Added to Neutralize ________ mL ________ mL ________ mL Molarity of NaOH ________ M Calculations: Average Molarity and Standard Deviation of Citric Acid: Average Weight Percent and Standard Deviation of Citric Acid:
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Honors+Acid-Base+Experiment - CHEM 1310 HONORS Dr. Charlie...

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