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

    and record the result from the screen. I will perform 2 repeats for each distillate and average these results. To maintain the accuracy of the pH meter I will wash it with distilled water after every test and this will ensure that my results are not affected by my previous readings. Results: Titration: Malt Vinegar: Titration no.

  2. 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.

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

    reacts with one mole of the alkali (NaOH). Therefore from this we now know that there are 1.877 � 10-3 moles in 20 cm3 of acid. Knowing this, the concentration can now be found out by putting the information into this formula (the formula was derived from the "M V over a thousand" formula): Molarity = No.

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

    So less hydroxides ions will be needed to neutralise them. Method First clean the equipment that I am going to use to ensure that no other chemicals are left on them that could affect the experiment. I will do this by swilling water round them then swilling the solution that's going to go into the equipment.

  1. Who’s Cheating on the Vinegar?

    equation, Na stands for the number of moles in the acid, Nb stands for the number of moles in the base. These figures are obtained from the balanced equation. Ma stands for the molarity of the acid, and Mb represents the molarity of the acid.

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

    ONLY light Bunsen burner when it is needed, when it is not being used remember to turn it off 6) Wait for any apparatus to cool down before dismantling it 7) Work in a well ventilated area 8) Where necessary carry practicals out in he fume cupboard as substances may release harmful fumes 9)

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