To find out which brand of vinegar is cheaper

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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.
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RESULT:

BRAND A

Mean volume:26.55 cm3

BRAND B

Mean volume:23.35 cm3

CALCULATION:

CH3COOH + NaOH → CH3COONa + H2O

BRAND A

No. of mole of NaOH used: (26.55 ÷ 1000) × 0.1=0.002655

No. of mole of NaOH used : No. of mole of CH3COOH used in titration

=1:1

No. of mole of CH3COOH used in titration = 0.002655

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 ...

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