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 = 4
2O = 2 ☓ 16 = 32
24 + 4 + 32 = 60
Then to get my control results I had to multiply 37.75 by 60 and then I have to multiply that again by 10, which equalled 90.6 g/l.
Now this was done, I had to do the four fish and chip shop samples.
Blue Whale = I carried out the experiment again as shown above. I recorded the results three times and got these readings.
1st 41 cm3
2nd 39 cm3
3rd 39 cm3
I then added all the readings together and divided then by three and got 39.7 cm3. I Then multiplied it by 0.1 after this I divided it by 25 and I got 0.1588. Then I multiplied it by 60 and got 9.528, then multiplied this by 10. Then after this long equation my final result came out as 95.28 g/l. This concludes that the Blue Whale fish and chip shop do not dilute their vinegar.
Fish Frier = I did the experiment again but with the different sample and got these results.
31 + 29 + 27 / 3 = 29
-
☓ 29 ☓ 1 / 25 ☓ 1 = 0.116 ☓ 60 = 9.96 ☓ 10 = 69.6 g/l
This concludes that the Fish Frier fish and chip shot dilute their vinegar a lot.
Frying Tonight = I did the experiment again this time I got these results.
16 + 17 + 15 / 3 = 16
16 ☓ 0.1 ☓ 1 / 25 ☓ 1 = 0.064 ☓ 60 = 3.84 ☓ 10 = 38.4 g/l
This concludes that the Frying Tonight fish and chip shop dilutes their vinegar a great deal more than they do at the Fish Frier fish and chip shop.
Frier Tuck = finally I did the experiment one last time and got these result.
21 + 21 + 21 / 3 = 21
21 ☓ 0.1 ☓ 1 / 25 ☓ 1 = 0.084 ☓ 60 = 5 .04 g/l
These results conclude that the Frier Tuck fish and chip shop do also dilute their vinegar.
RESULTS TABLE
James Farmer
Plymouth C.F.E
Goschen centre
Plymouth
PL2 2DP
Tel: 01752 305081
6/12/02
Mr R Roberts,
Trading Standards Department,
Plymouth City Council,
The Council Building,
Royal Parade,
Plymouth PL4 6DH
Dear Sir,
You contacted me to find out whether your local fish and chip shops have been watering down the vinegar used on customer’s food, In the attempt to save money.
I have carried out many tests, and analysed the vinegar from the four fish and chip shops with the control.
The tests that I carried out were that I measured 25 cm3 of each vinegar sample and added an indicator (phenolphthalein) to them. I then measured the amount of sodium hydroxide I added to the vinegar solution until it turned to the colour pink.
These are the test results:
These results conclude that the following fish and chip shops dilute their vinegar: Fish Frier, Frying Tonight and Frier Tuck. The results also include that Blue Whale fish and chip shop don’t water down their vinegar.
I hope that my investigation has been of help.
Yours sincerely
James Farmer