Chem A2 Coursework
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A very common one for salters is titration to determine the aspirin content of various tablets, or comparing shop bought tablets to a sample you make your own
Ummm also vitamin C in oranges...
Ummm effect of concentration on the action of catalase.... -
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Hi,
I'm doing oscillating reactions. On my college intranet there is a lost of suggessted investigations, which I have copied below. There is then a word file on each one, which I can send u if u are interested.
No Investigation Version
- Introduction and Index Word PDF
1 Investigating conductivity Word PDF
2 Investigation the analysis of wine Word PDF
3 Investigating the analysis of sugars Word PDF
4 Investigating solubility Word PDF
5 Investigating the analytical techniques for the detection of copper ions Word PDF
6 Investigating the formulae of complex ions Word PDF
7 Investigating the hydrolysis of fats and oils Word PDF
8 Investigating the oxidation of fats and oils Word PDF
9 Investigating the saponification of fats and oils Word PDF
10 Investigating unsaturation in fats and oils Word PDF
11 Investigating electrochemical cells Word PDF
12 Investigating electroplating Word PDF
13 Investigating the electrolysis of sodium chloride Word PDF
14 Investigating the formulae of chlorides Word PDF
15 Investigating the analysis of vitamin C Word PDF
16 Investigating ion exchange Word PDF
17 Investigating acid-base reactions Word PDF
18 Investigating dyes Word PDF
19 Investigating the hardness of water Word PDF
20 Investigating the acidity and alkalinity of water Word PDF
21 Investigating the hydrolysis of halogenoalkanes Word PDF
22 Investigating the reaction between thiosulphate ions and acids Word PDF
23 Investigating the reaction between manganate(VII) ions and oxalate ions Word PDF
24 Investigating the reaction between peroxodisulphate ions and iodide ions Word PDF
25 Investigating the reaction between magnesium and acids Word PDF
26 Investigating the reaction between propanone and iodine Word PDF
27 Investigating the reaction between hydrogen peroxide and iodide ions Word PDF
28 Investigating silver nitrate titrations Word PDF
29 Investigating esters Word PDF
30 Investigating the decomposition of hydrogen peroxide Word PDF
31 Investigating light emission by luminol Word PDF
32 Investigating the dissolved oxygen content of water Word PDF
33 Investigating the effect of fluoride ions on the reaction of calcium carbonate with acid Word PDF -
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i do salters and I have absolutely no idea what I'm going to do! I definately don't want to do a titration tho - i always mess them up. My teacher gave us a sheet with lots of ideas on there...but i can't say any of them really grab me. I just need some inspiration...*sighs*
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Investigating the rate of reaction between magnesium and sulphuric acid
Background
Magnesium reacts with sulphuric acid to produce hydrogen gas and a salt
Mg(s) + H2SO4 (aq) → MgSO4(aq) +H2 (g)
A gas is produced, so the reaction rate can be followed by measuring the change in mass of the reaction system or the gas could be collected.
Practical Techniques
You will need to find out about how to make up accurate solutions.
Where to start
Plan an experiment to investigate the effect of varying the concentration of sulphuric acid on the rate of this reaction.
Possible Investigations
•Investigate the effect of other acids (including weak acids) on the rate of the reaction. You will be able to find the order of reaction for each acid and hence the rate equation for the reaction.
•Investigate the reaction at different temperatures to determine the effect of temperature on the rate and hence determine the activation enthalpy for the reaction.
•Investigate a different technique for monitoring the rate of the reaction – possibilities are –conductivity, pH.
•Investigate the effect of adding transition metal ions to the reaction
Sources of Information
•Denby D., The reaction of metals with acids, Chemistry Review, January 1996
•The Chemistry Video Consortium and The Royal Society of Chemistry (2000) Practical Chemistry for Schools and Colleges CD ROM
•Thorpe A., Making a standard solution, Chemistry Review, November 2002
•Lindsey D., Measuring pH, Chemistry Review, September 1998
•Hill G. C. and Holman J., (2001), Chemistry in Context Laboratory Manual (Fifth Edition), Nelson Thornes
•Hacker R.G., Williams I.W., (1970) Design for an experiment: an introduction to kinetics, Education in Chemistry, Vol7/1
•http://users.erols.com/merosen/kinetics.htm
•Thorpe A., Assessing the risks in practical work, Chemistry Review, September 2000
•Thorpe A., Experimental error and error analysis: just how good are those results, Chemistry Review, November 2001
Teachers' Notes
General
This investigation is based around a very simple experiment. It is an experiment that is often carried out at GCSE level and therefore teachers must make students aware that they need to approach this investigation at the appropriate level. The practical techniques are very straightforward and students of all abilities should be able to carry out the experiments successfully. If a technically more demanding investigation is required students should investigate the other techniques suggested.
As the reaction is exothermic, students will need to design their experiment very carefully if they wish to investigate the effect of temperature on this reaction.
Chemical Principles
Reaction Kinetics, reactions of metals and acids
Essential Equipment
Burettes, pipettes, electronic balance
Essential Chemicals
magnesium, sulphuric acid,
Safety
No risk assessment has been given. It is essential that students prepare a detailed risk assessment before they start. Teachers must be satisfied that this is suitable for the proposed investigation.
Starter Experiment- Investigating the rate of reaction between magnesium and sulphuric acid
Prepare the following solution
•Sulphuric acid 2 mol dm-3
You will need to think about how much of this solution to prepare. This will depend on how much of the solution is used in each experiment and how many experiments you do (including any repeats).
Use pipettes and /or burettes to put the following solutions into a conical flask.
Expt Sulphuric acid
(cm3) Water
(cm3)
1 100 0
2 80 20
3 60 40
4 40 60
5 20 80
Place the flask on to an electronic balance. When you are ready to start you should add measured amount of magnesium ribbon to the solution and start timing. You need to record the time at regular intervals until the reaction stops or you have enough readings to plot a graph.
