Whos cheating on the vinegar? Essay

Published: 2020-01-12 14:41:24
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Category: Cheating

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A chip shop owner buys his vinegar from 4 different suppliers A, B, C and Safe way. He suspects that at least one of them waters down the vinegar supplied to them by the manufacturer. You are the analytical chemist assigned to investigate this. You have already planned an experiment that will give you the evidence you need. The following results have been taken from a similar experiment. Your task is to analyse these results and present your conclusion. You must then evaluate the experiment by assessing its success in answering the original question, explaining any anomalous results, and suggesting any possible improvements.

Aim: I have been asked to find out if any of the suppliers have been watering down the vinegar they have supplied to the chip shop owner. I will do this by using a technique called Titration. Vinegar is ethonoic acid What is Titration? Titration is a form of neutralisation. This is a process of determining the concentration of a substance in solution. A measured amount of a known solution concentration (molarity) is added to an unknown volume of a second solution in carefully measured amounts until a reaction of definite and known proportion is completed.

Neutralisation is when a Hydrogen ion and a Hydroxide ion react together to form water which is neutral.  Variables:  Amount of acid (vinegar) Sample of Vinegar I will be changing the vinegar samples as I will be testing shop A, B, C and Safe Way. The amount of alkali will change because the vinegars may have different molarities. Apparatus:  An Acid An Alkali  A Burette  A conical flask A stand and a clamp A beaker  A Pipette An Indicator (methyl orange) . Theory:

Whichever vinegar needs the most alkali to neutralise the acid has been watered down, once this has been done the results have to be calculated into the same units, I will be using moles (M). the difference between the molarity of the acids can tell me which has been watered down the most. Prediction: The acid with the lowest molarity has been watered down, but unless I test pure ethonoic acid, or find out its molarity then I dont know if the highest molarity of acid has been watered down. Diagram: Method: Step 1: Wash out all equipment. Step 2: Set up the stand and fit the burette in place with the clamp above the conical flask.

Step 3: Take out the burette and fill with sodium carbonate. Step 4: Measure the first acid (shop A) in the pipette then put into beaker underneath, then take the conical flask from under the burette and pure in acid. Step 5: Dilute the acid with pure H2O so there is a higher volume to work with Step 6: Start the titration by turning the tap of the burette very slightly and adding a small amount of sodium carbonate at a time. Step 7: Record results in a table.

Step 8: Repeat the experiment so you have two sets of results Step 9: Repeat all steps with the other acids Test results: A Na2CO3 = sodium carbonate CH3COOH = ethonoic acid Equation for the reaction of neutralisation with ethonoic acid and sodium carbonate: 2 CH3COOH + Na2CO3 i?? 2CH3COONa + CO2 + H2O This equation shows that; 2 moles CH3COOH = 1 mole Na2CO3 So to work out the molarity of each acid I need to use the equation below: (V = volume M = molarity).

The acid with the lowest molarity has been watered down. I know this because it took less alkali to neutralise it. Shop B, Safe Way and Shop C have obviously been watered down because they have a lower molarity than shop A. So the chip shop owner should only buy shop A vinegar as it is the strongest and he is getting more vinegar for his money.

Evaluation: To ensure my experiment was a fair test I had to make sure all the variables were the same. I made sure the factors, which needed to be constant, were constant, for example the volume of vinegar was measured accurately. I also made sure any human errors such as not switching the tap off in time were to the best of my ability. This made the experiment a fair test. These are important factors because it can be detrimental to how accurate my results are. The test was a success because we found out which was the strongest vinegar for the chip shop owner to buy.

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