3. (6 pts) In your laboratory notebook write down the step-by-step procedure tha

Question

3. (6 pts) In your laboratory notebook write down the step-by-step procedure that you will use to solve the puzzle. Remember to include the preparation of your anal solution. yte Preparation of your analyte solution: Measure 25 ml of vinegar and add it to a 250 ml.Erlenmeyer flask 40 mL of water and 2 drops of indicator-to the Erlenmeyer flask that contains the vinegar. 4. (12 pts) Record all of your observations and all of the data that you collect in your 5. (6 pts) Make sure that you organize your data into either a data table or a graph. 6. (4 pts) In your laboratory notebook write down a conclusion for the day laboratory notebook.

Explanation / Answer

Preparation of analyte solution              

Measure 25 ml vinegar by pipet and add it to a 250 ml Erlenmeyer flask. Dilute the sample with 40 mL of water and add 2 drops of phenolphthalein as indicator.

Vinegar is an acidic liquid, which contains acetic acid, CH3COOH.

Now titrate acetic acid solution with known concentration of sodium hydroxide solution.

If the concentration of one of the solutions is known, the concentrations of the others can be determined from the volumes used.

The reaction equation is:

CH3COOH (aq) + NaOH (aq) -----> H2O(l) + CH3COONa(aq)

The Titration of acetic is performed by slowly adding the NaOH to the analyte solution via the burette until the color of solution is changed. This is an endpoint of titration. The endpoint of the titration will be detected by observing the color change for a phenolphthalein indicator added to the Vinegar. Phenolphthalein is colorless in vinegar solution. At the endpoint the, the color of solution is pink, because phenolphthalein is pink in basic solution. The endpoint will represent the equivalence point; the point at which the added amount of titrant is equivalent to the amount of analyte. By knowing the concentration and volume of the NaOH used, the number of moles NaOH can be determined. We can determine the amount of analyte present using the reaction stoichiometry.

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