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DATA TABLE Trial 1 Trial 2 Trial 3 g. Mass of vinegar g 19.518 21.0 ml Initial buret reading mL mL Final buret reading 42.80 ml mL ml ml Volume of NaOH used ml mL
DATA TABLE Trial 1 Mass of vinegar Initial buret reading 19.518 21.0 142.80mL ml Final buret reading Volume of NaOH used 21.80 mL
10 EXPERIMENT Titration of Vinegar PURPOSE To determine the mass percentage of acetic acid in vinegar. OVERVIEW Vinegar is an aqueous solution of acetic acid (CH,COOH). In this lab exercise, the mass percentage of acetic acid in vinegar will be determined by titrating the vinegar with a sodium hydroacide solution of known concentration. CH,COOH (aq) + NaOH(aq) --- CH,COON: (a) +H.00) PROCEDURE 1. Rinse the buret thoroughly with distilled water, then clamp it to a ring stand. Allow excess water to completely drin. 2. Make sure the stopeock is closed and carefully add about 10 ml. of 0.40 M NaOH. Drain some of the NaOH into a 250 ml. beaker, then invert the bu ret and pour the remainder out the top i the beaker, allowing the NAOH to coat the inside of the buret. Use a wash bottle to rinse the top of the inverted buret to prevent NaOH from dribbling down the outside. Discard the NaOH as instructed 3. Pour about 60 mL of vinegar into a 150 ml beaker, cover it with a watch glass, and set it aside. 4. Secure the buret to the ring stand and fill it with 0.40 M NaOH. Draina little of the NaOH into a beaker to expel air from the buret tip.(The NaOH collected may be added back to the buret or saved for the next trial.) 5. Record the initial buret reading in the data table for Trial *1.
6. Place the 125 mL Erlenmeyer flask on the electronic centigram balance and tare the flask by briefly pressing the on/off button. The balance should read "0.00 g" with the flask on it. 7. Remove the flask from the balance and add -20 mL of vinegar using a graduated cylinder. 8. Return the flask to the balance and record the mass in the data table for Trial #1. This is the mass of vinegar. 9. Add 2 drops of phenolphthalein to the Erlenmeyer flask and begin the ti- tration by slowly adding NaOH dropwise from the buret. Make sure the tip of the buret is inside the flask and gently swirl continuously to ensure proper mixing. A paper towel should be placed under the flask to aid in seeing the color change. 10. As the reaction nears completion, the bursts of pink color that appear with each drop will linger more and more. It is very important to proceed slow- ly—one drop at a time-to avoid overshooting the endpoint. 11. When a light pink color persists throughout the solution, the end point has been reached. Record the final buret reading. 12. Discard the contents of the Erlenmeyer flask down the sink and rinse the flask with distilled water. 13. Carry out two more trials (it is not necessary to refill the buret after the first trial). 14. When finished, return any unused NaOH to the appropriate container. Thoroughly wash all glassware and return all equipment to the proper locations.