Solid State Periods 12 Classification of solids based on different binding forces: Relation between Gibbs energy change and EMF of a cell, fuel cells; corrosion.
A few health and safety ideas on risk assessment AIM for a high investigation-project mark - you have nothing to lose for your assessment! Decomposing hydrogen peroxide with a solid catalyst or soluble transition metal compound.
Enzyme catalysed reactions e. The sodium thiosulphate-hydrochloric acid reaction, you can investigate the effects of temperature and concentration.
Your write-up must be your work produced from your study and your experiments. This web page is meant to teach you how to tackle an coursework e. Your coursework write-up must expressed in your language and expressed at 'your scientific level'. Your teacher will have a good idea what to expect and you must be able to justify all your write-up.
More marks are lost by not writing things down, than by not doing experiments!
Published: Mon, 5 Dec To study the effect of reactant concentration on the rate of the reaction between sodium thiosulphate and hydrochloric acid AND to determine the order of sodium thiosulphate. Sodium thiosulfate solution is reacted with acid – a sulfur precipitate forms. The time taken for a certain amount of sulfur to form can be used to indicate the rate of the reaction. In this experiment I will be seeing how the concentration of Sodium Thiosulphate, Na2S2O3, and Hydrochloric Acid, HCl, affects the rate of the reaction. In this reaction the solution turns milky yellow as sulphate is displaced and forms a solid precipitate.
For sources and references you should research 'rates of reaction' for theory, experimental methods etc. Word process your work if you can and your results can be tabulated and processed into graphs using software packages like Excel Preliminary work usually involves doing a few trial runs of the experiment to see how it goes and making Concentration sodium thiosulphate coursework if necessary.
By writing up how, and why, you have changed the experimental conditions or 'recipes' you can gain more marks. Planning - the theory and your experiment design! If you are confident and chosen the VARIABLE you want to investigate you should try to make a prediction and maybe justify it with some theory if you can.
You can continue in a broader context by introducing some background theory and descriptions of the factors or VARIABLES which may have an effect on the rate of the reaction you are studying include briefly factors which might not apply. In your 'method' description use the correct units or descriptors.
The factors to discuss might be Is there any other factor for the reaction you are studying? If you have decided, for example, to investigate the effect of acid concentration on the speed of a reaction, then everything else should be kept constant for a fair test, and this should be obvious in your plan for the reasons discussed above!
If you haven't already chosen the VARIABLE, do so now, and make a prediction and justify it with some theory which you may have previously described and should refer to.
If a gas is formed, there are at least two ways of collecting a gas e. Briefly explain how the method can be used to measure the speed - the results of the first few minutes is usually the most crucial - you can discuss briefly other methods, but perhaps better in evaluation as a means of further evidence.
When you have decided on the method, give a detailed description of how you might carry it out. Clearly indicate why the method would be expected to produce precise and reliable evidence - the results!
Include 'health and safety' points. If you are looking at changing the reaction temperature, its not easy to accurately vary and control the temperature of the reactants without a thermostated water bath to hold the reaction flask in.
Even with a thermostated water bath normally only available to advanced level studentsall the reactant solutions should be pre-warmed in the bath before mixing and start the timing and recoding of results.
If you are varying temperature, you need to heat up the reactant solutions separately and take their temperatures, mix, start stopwatch. However, they will cool a little standing out in the laboratory, so not completely satisfactory solution to the problem.
In the case of the sodium thiosulphate - acid reaction, you can leave the thermometer in the flask and take the temperature at the end, then use an average for the temperature of the reaction. If temperature isn't a variable, it must be kept constant.
The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson.
Then, they will all be at the same temperature, which should be recorded. If more experiments are conducted at another the time, the temperature must again be checked and recorded.
Refer to any previous laboratory experience with 'rate of reaction' experiments which may have helped you decide and design the experimental method. Obtaining evidence - observations, measurements, in other words the results!The purpose of this demonstration is to investigate the effect of sodium thiosulfate concentration on the rate of reaction of sodium thiosulfate with hydrochloric acid.
The reaction, which produces solid sulfur, will be followed by measuring the time needed for the reaction mixture to become opaque. In this experiment I will be seeing how the concentration of Sodium Thiosulphate, Na2S2O3, and Hydrochloric Acid, HCl, affects the rate of the reaction.
In this reaction the solution turns milky yellow as sulphate is displaced and forms a solid precipitate. Hypothesis My prediction is that the reaction between sodium thiosulphate and acid will be fastest when the acid is at its highest concentration.
This is because there will be more acid molecules in the same amount of solution, therefore more effective collisions with the sodium thiosulphate, and the rate will be higher.
Jul 31, · Solutions unknown concentration of sodium thiosulfate Na2S2O3 mol L-1 KIO3 mol L-1 show more regardbouddhiste.com a little help with calculating the concentration of the sodium thiosulfate for a chemistry internal.
Dont no really where to start so any help will be great or if you can solve it will be any regardbouddhiste.com: Resolved. To investigate the effect of concentration on the time of reaction between two chemicals: hydrochloric acid (HCl) and sodium thiosulphate (Na2 S2 O3).
Introduction In the experiment I am going to investigate the reaction between sodium thiosulphate and different concentrations of hydrochloric acid and how long does this take. To show this I will be changing the concentration of Hydrochloric acid and adding it to sodium thiosulphate.
To show how fast they have reacted I will time .