CH116Lab5AcidContentofCommercialSoda

CH116Lab5AcidContentofCommercialSoda - 1 Dr March CH116-G3...

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1 Dr. March CH116-G3 September 28, 2009 Lab 5: Acid Content of a Commercial Soda I. Experimental Procedure 1) Prepare the KHP solution by dissolving the calculated amount of solid KHP into approximately 50 mL of water. Make several of these solutions, since you will want to repeat your titration several times for accuracy. 2) Rinse a 50 mL buret and fill it with the aqueous sodium hydroxide solution. 3) Add 2-3 drops of phenolphthalein to the KHP solution, and then slowly titrate (add NaOH until very light pink). 4) Repeat this experiment with a new KHP sample until the desired precision is attained. Remember that the pink end-point should be as light as possible. 5) Next, refill the buret with 50 mL of NaOH, and titrate with approximately 10 mL of a clear, citrus-flavored soda. To minimize error, make sure that the soda is not carbonated. If it bubbles at all, boil it before titrating. When this is done, add 2-3 drops of phenolphthalein as before, and titrate until you reach the light pink end-point.
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