0.4425 M-04397 M0028 M This is a measure of the precision of your results and th
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0.4425 M-04397 M0028 M This is a measure of the precision of your results and the answer should be reported as The molarity of vinegar can be calculated in a similar manner using the stoichiometry of 0.0045 M+3 0.0015 M 0.4397 0.0015 M the neutralization reaction between NaOH and vinegar. Part II Acid-Base Titration Refill your buret with 0.15 M NaOH solution as close to zero as possible and record the initial volume on the Part II data table t two vinegar samples, 5.0 mL each, into the clean 125/250 mL Erlenmeyer flasks. Pipet CAUTION: Use a pipet bulb or pipet pump to draw liquid into the pipet. Never mouth pipet 2. Record number (or name) of unknown on the Part II Data Table Add about 20 mL of distilled water to each flask containing unknown vinegar using a clean graduated cylinder. Then add 1-2 drops of phenolphthalein to each flask. 3. Add a stir bar to one of the flasks and place flask under the buret tip. Slowly add NaOH from the buret, with stirring in approx. 1 mL increments. Note the color of solution after each addition. The color will disappear upon swirling. As you do the titration, occasionally rinse the walls of the flask with deionized water from a wash bottle. 4. When the pink color starts to persist, switch to adding the NaOH drop by drop. The endpoint is reached and the titration is complete when an addition of a drop of NaOH 5. causes the color of the solution to change from colorless to a light shade of pink that persists for 30 seconds 6. Pour the solution from the Erlenmeyer flask into the beaker labeled "Discarded Solutions" 7. Repeat steps 4-6 with the last vinegar sample. 8. Once all titrations have been performed and the T.A. has marked your data sheet proceed with cleaning up all solutions and equipment. Drain any excess NaOH from your buret as well as any residual 0.15 M stock NaOH into the beaker labeled "Discarded Solution" Rinse the buret with 3 aliquots of water, approximately 10-15 ml each. Place equipment in areas indicated by T.A. 9. amount of running water. If solution is outside of stated pH range, neutralize the solution using supplied acid/base solutions before dispensing in down drain. 10. Check the pH of the solution in the beaker labeled "Discarded Solutions" using a piece of pH indicator paper. If the pH is between 6-8, pour solution down the drain with a large 46Explanation / Answer
To find out the molarity of vinegar with the help of NaOH, we first need to know the actual amount of both the reagent used in the neutralisation reaction , and the molarity of NaOH solution.
Then using the formula M1V1 = M2V2 , where M represents the molarity and V represents the volume , the molarity of the vinegar solution can be found out.
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