• 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

Who's Cheating on the Vinegar? Aim: To find out if chip shop A, B, or C is watering down it's vinegar Predictions: There has to be different levels of acidity in vinegar whether the shop owner watered it down or the amount of alkali is too high, and because the equations are - CH3COOH+NaOH(aq) CH3COONa(aq)+H2O(l) Ethanoic + Sodium Sodium + water Acid hydroxide Ethanoite The vinegar to be neutralized there will have to be more sodium hydroxide in the solution to neutralize it because it is an alkali. This is the equation gives phenolphthalein, In this investigation, I am going to be finding out and investigating one of the five factors, which affects the concentration of vinegar: volume of sodium hydroxide (base solution). Variables: Key: Alter=change Green Tick = stay the same > Concentration of vinegar -alter * Volume of vinegar * Amount of indicator * Concentration of sodium hydroxide > Volume of sodium hydroxide- alter Concentration of vinegar - if there is a concentration of vinegar increase the vinegar will be stronger and the results will change and the amount of sodium hydroxide will be less. Volume of vinegar- needs to stay the same otherwise there will not be a reliable set of results because the volume of sodium hydroxide may increase or decrease. ...read more.

Middle

then place the flask directly under the burette and little by little add the sodium hydroxide so that it turns purple, then turn the tap off and measure accurately where the sodium hydroxide has stopped. This experiment has to be carried out extremely accurately other wise the results would not be reliable and completely inconsistent. It is also vital that everyone works together to ensure the best possible outcome of results Observation: This experiment was quite easy to complete if done correctly, however I did find problems while trying to measure the reading of the sodium hydroxide because they were inconsistent and needed to be tried again, other than that the experiment was a complete success. Fair Test: To ensure my experiment was a fair test I had to cover a few things. I made sure the factors which needed to be constant were constant such as the volume of vinegar was measured accurately, the amount of indicator was added drop by drop, the concentration of sodium hydroxide was all ready supplied, I made sure any human errors such as not switching the tap off in time was switched of to the best of my ability and if the tap was not switched off and it overdosed the vinegar the test would be preformed again until it is acurate and so making this experiment a very fair test. ...read more.

Conclusion

I have also found that two of my results in the table have shown the concentration of acid to be weak this is due to more sodium hydroxide being present in the vinegar solution. The graphs make this clear to understand. I found that doing a preliminary experiment helped me in my real experiment because I knew what to do and what to expect. Linking my conclusion to prediction: I predicted the more sodium hydroxide added to vinegar the less concentrated the vinegar would be, I have proved this I my experiment shown in my tables and graphs of results. Evaluation: I feel that I preformed this experiment quite well and completed it in the time required during the lesson; I think that this experiment has been a very successful one as my results supported my prediction. I feel my results were particularly accurate as I did measure the volume of sodium hydroxide 3 times in each vinegar, but if I were to do the experiment again I would do it a few more times just for extra accuracy for reliability, the tables and graphs showed straight forward results and there were no strange results (anomalies) I think this was due to accuracy and precision. I believe I could have went in more depth in my method by making it more specific but I did mention all that I did in this experiment. Sean Greaves ...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 Aqueous Chemistry section.

Found what you're looking for?

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

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 Aqueous Chemistry essays

  1. Concentration of Vinegar

    * Handle all glassware with care as they may be hot after a reaction takes place. Risk Assessment Sodium Hydroxide in its pure form is very corrosive and can cause severe burns. In its diluted form it is less harmful, but still an irritant.

  2. Vinegar. In this investigation I am going to find out the concentration of ethanoic ...

    In each of the experiments the total amount of liquid in the mixtures will be 100ml.

  1. Investigation to Determine the Composition of Commercial Vinegar.

    An indicator is used to identify the end point of a titration. The end point is when the correct number of moles have been added for complete reaction. N.B. In Acid/Alkali reactions the pH may not be 7. An indicator changes colour as the pH changes.

  2. Back Titration to find the Concentration of Vinegar (Ethanoic Acid)

    1.24* + 1.25* 3 = 1.25cm3 Concentration of NaOH = 0.08 mol dm-3 (for accuracy) Volume of CH3COOH = 1cm3 Concentration of CH3COOH = ? ?Moles of NaOH = concentration of NaOH X average volume of NaOH in dm3 = 0.08 X 1.25 1000 = 0.0001 moles ?Moles of CH3COOH can be calculated from the balanced equation: CH3COOH(aq)

  1. Analysing the ethanoic acid concentration in different types of vinegars.

    However as the vinegars are a mixture of various acids I cannot obtain a Ka value for it and so will not be able to work out a value for the [Acid] from the vinegars from my pH readings. However I will still measure the pH of the vinegars, as

  2. Determine the concentration or molarity of Ethanoic acid (CH3COOH) in two types of commercial ...

    of the results will be taken. The concentration of the ethanoic acid in vinegar can then be found out from this average this result by carrying out various calculations which will be demonstrated later. Results: The procedure as described in my plan was carried out and was done so for both vinegars.

  1. Obtain pure samples of Ethanol (CH3CH2OH) and Ethanoic Acid (CH3COOH) from fermented Yeast (Saccharomyces ...

    x 100% The overall reaction taking place will be: CH3COOH + NaOH CH3COONa + H2O RISK ASSESMENT The substances used in the practicals will be very hazardous, so the correct precautions that will need to be taken are: 1) LAB COATS must be worn to protect clothing 2)

  2. Investigation to find out if vinegar from chip shops is watered down

    I predict the more watered down the vinegars are the less alkaline (sodium hydroxide) would be needed to neutralise it. This is because the more water added, the less concentrated it would be and therefore there would be less hydrogen ions in the same volume.

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