• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Who's cheating on the vinegar?

Extracts from this document...

Introduction

Chemistry Course Work - Neutralisation of ethonoic acid Who's cheating on the vinegar? Task: 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? ...read more.

Middle

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 don't 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. ...read more.

Conclusion

Shop B = 0.021 M 3. Safe Way = 0.014 M 4. Shop C = 0.0088 M Conclusion: 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. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

3 star(s)

Response to the question

The focus on the question is done well, and the candidate shows good basic research behind the topic. The candidate needs to make sure they understand basic theory to avoid errors that are seen in some places.

Read full review

Response to the question

The focus on the question is done well, and the candidate shows good basic research behind the topic. The candidate needs to make sure they understand basic theory to avoid errors that are seen in some places.

Level of analysis

The task is very interesting and is outlined well. They outline the background and theories behind the experiment well explaining the different concepts. Their theory is correct, but they should explain the reasoning behind this using the collision theory. They do not indicate the indicator they are going to use to note the colour change and this would be good to include because it would show understanding of how to choose the best indicator colour. The candidate is wrong in their theory, as the alkali with the strongest molarity needed the most alkali to neutralise it, so they should rethink their answer. The evaluation is good, but needs to expand more on things that could be improved in the experiment to make it better.

Quality of writing

Punctuation, grammar and spelling good throughout. Format is split up clearly. No diagram included where it should of been or it doesn't show in the PDF.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by skatealexia 25/08/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. Peer reviewed

    Rates of Reaction

    5 star(s)

    The minimum amount of kinetic (movement) energy that two particles need if they are going to react when they collide is called the activation energy. There are four ways that the rate of reaction can be increased. These are: 1)

  2. Rates of Reaction - The Iodine Clock

    H2O 167 164 173 163 Na2S2O3 2 5 5 5 KI 10 10 2 10 H2O2 10 10 5 5 H2SO4 10 10 10 10 Starch 1 1 1 1 Time (secs) 7.5 24 213 44 RESULTS: 1 2 3 4 5 6 Volume (ml)

  1. Effect Of Substrate Concentration On The Activity Of Catalase

    This is called the transition state. The total kinetic energy of reactant molecules must be at least as high as the activation energy to be able to achieve the transition state, so the reaction can proceed. For a reaction to occur there must be successful collisions in which: 1)

  2. The Effect of Catalase in the Breakdown of Hydrogen Peroxide

    This error would mean the results are inaccurate because the experiment involved inaccurate measurement and it is possible that some samples are higher then others. It is important that the conical flask is not shaken throughout the reaction as it can seriously affect the rate of the reaction, thus; altering the results.

  1. The aim of the investigation is to examine the kinetics involved in the reactions ...

    Hence, there will be a greater amount of [H+ ] protons in the acid and [Cl -] ions in the conjugate base. This provides a larger Ka value. The Ka value is the dissociation constant for the acid. = [H+ ] [Cl - ] [HCl (aq)] = 1.7 x 10-5mol

  2. The effect of concentration on the activity of catalase.

    Delivery Tube -->Will be used to transport the oxygen produced in the conical flask to the measuring cylinder. 10. Measuring cylinder --> Will be used to measure the quantity of oxygen gas produced. 11. Hydrogen peroxide -->One of the reactants.

  1. Change in reaction times due to alcohol consumption.

    However, frequent alcohol consumption does not allow the body to maintain its equilibrium. The liver has limited ability to metabolize toxic substances. APPARATUS ? 5 Participants, (All in the age group of (18-19 and all female) ? Meter Ruler (for first reaction time test)

  2. To investigate the effect of varying the masses of white sugar and yeast and ...

    Because of their complex composition, these sugars will be used later on in the fermentation process. The lapse of approximately 30 minutes at the beginning of the fermentation period is necessary to achieve their enzymatic transformation into simple sugars. The enzymes involved are saccharase, which transforms saccharose into glucose and fructose, and maltase, which transforms maltose into glucose.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work