I have been asked to find out if four fish and chip shops have been diluting their vinegar, to save more money. I do this by carrying out a few experiments, testing on the separate fish and chip shops vinegar samples.

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QUALITY OF VINEGAR

Task

I have been asked to find out if four fish and chip shops have been diluting their vinegar, to save more money. I do this by carrying out a few experiments, testing on the separate fish and chip shops vinegar samples.

Apparatus

  • Vinegar samples

  • Distilled Water

  • Sodium Hydroxide
  • Phenolphthalein
  • Conical Flask
  • Volumetric Flask
  • Burette + Stand
  • Pipette
  • Balance
  • Tile

Method

To carry out this experiment, I first had to get the control vinegar and measure how much ethanoic acid I found in the vinegar, then compare with the fish and chip shops.

So to do this I filled the burette with the sodium hydroxide, I then added 10cm3 of distilled water to 100 cm3 of the vinegar to dilute it (this was so when the colour changed I could see it)! After this I got 25 cm3 of the vinegar and put it in the conical flask, then to this I added the indicator.

I added the sodium hydroxide slowly to the solution in the conical flask until the sample turned pink, I then read the number of cm3 of sodium hydroxide had gone into the conical flask off the burette and kept the reading.

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I repeated this experiment three more times, to get more results for a better average. Then with all the results collected I had to calculate the average.

  • Add all readings, then divide by three. The result was 37.75 cm3

Equation

M = Molar cone

V = Volume used

N = Number of molars reacting

M1 = M2  V2  N1 / V1  N2 = 0.1  37.75 / 25  1 = 0.151

( CH3 CO2H + NaoH  CH3 CO2 Na + H2O )

2C = 2  12 = 24

4H = 4  1 = ...

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