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To find out which brand of vinegar is cheaper

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Introduction

Experiment 6 AIM: To find out which brand of vinegar is cheaper. PROCEDURE: 1. 25cm3 of vinegar was pipetted to a 250 cm3 volumetric flask. 2. The volumetric flask was filled to 250 cm3 with water.. 3. 25 cm3 of solution in the flask was pipetted to a conical flask. 4. 2,3 drop of phenolphthalein was added. 5. The burette was filled with 0.10M sodium hydroxide solution.. 6. Solution in the conical flask was titrated against the sodium hydroxide solution. 7. The result was recorded. RESULT: BRAND A Brand Name: Narcissus-Rice Vinegar Price: $3.6 Volume: 250ml rough 1 2 3 Initial volume cm3 1.4 6.8 0.5 4.75 Final volume cm3 27.85 33.35 27.15 31.2 Net volume ...read more.

Middle

of mole of CH3COOH used in titration =1:1 No. of mole of CH3COOH used in titration = 0.002655 mass of CH3COOH per cm3 in a bottle is: 0.002655 ? (12 ? 2 + 1 ? 4 + 16 ? 2) ? 10 ? 25 = 0.06372 g Cost per mass of vinegar is: 3.6 ? (0.06372 ? 250) =$0.2259887 per g BRAND B No. of mole of NaOH used: (23.35 ? 1000) ? 0.1=0.002335 No. of mole of NaOH used : No. of mole of CH3COOH used in titration =1:1 No. of mole of CH3COOH used in titration = 0.002335 Mass of CH3COOH per cm3 in a bottle is: 0.002335 ? (12 ? 2 + 1 ? ...read more.

Conclusion

The 0.1M NaOH should be used to rinse the burette. Deionized water is used to rinse the volumetric flask. When vinegar is transferred to the volumetric flask, the vinegar should be used to rinse the pipette. While diluted vinegar is transferred, the diluted vinegar should be used to rinse the pipette. 2. Phenolphthalein, instead of other indicator such as methyl orange, should be used because phenolphthalein changes its color sharply at about pH7. 3. It is found that 3 drops, instead of 1 drop, of phenolphthalein should be added as it gives a sharper color change. 4. The diluted vinegar should first be poured into a small beaker before pipetting as it avoid the pollution of the whole diluted vinegar. ...read more.

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