please help me on the calculation. 97 Titration of Vinegar Objective Te determin
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Question
please help me on the calculation.
97 Titration of Vinegar Objective Te determine the concentration (molarity and weight percent) of acetic acid in a vinegar sarupic Back round Vinegar is a dilute solution of acetic acid (HC2H,02) in water. The concentration of acetic acid can be determined by titrating the acid with a known concentration of base solution. The end indicator which is colorless in acidic solution and red in basic solution. The endpoint will be the first pale pink that persists with mixing. The reaction is point in the titration can be determined using a phenolphthalein Procedure: 1. Pipet 5 ml. of vinegar solution into a 250 mL. flask. Add about 20 mL of deionized water (the exact amount is not important). 2. Add 3-5 drops of phenolphthalein indicator. 3. Fill a buret with 0.200 M NaOH. Record the initial volume to the nearest 0.01 mL. 4. Open the buret stopcocks fully, add the NaOII to the vinegar solution. Swirl the flask continuously. When the pink color begins to persist, slow down the addition of NaO1H. The endpoint is the first palest pink color that permanently persists with swirling. A corect end point occurs when gne drop changes the solution from colorless to pink. Record the final volume. 5. Repeat steps 1-4 twice.Explanation / Answer
your final trial 2 reading is not correct .its value should be nearer to the 1st one . there should not be large distance between them . and you have to use the average of the trials. then apply the formula
M1V1 = M2V2
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