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It is clear to me that the rest of my results are accurate as I have done three tests for each concentration this shows me that there was not to bigger range between results of the same category which assures me my results are accurate.Overall I feel that I have conducted a reliable and fair investigation. Some aspects are well written but brief and there is not enough mention of the scientific theory behind the investigation. There have been specific improvements suggested throughout.
The factors to discuss might be: amount of limestone? (1) its the hydrogen ion, H (aq), is the active ingredient that actually 'attacks' the metal or carbonate, and acids can ionise to different extents, (2) 1 molar or 1 mol dm-3 (1M) H2SO4 is twice as acid as 1M HCl because each H2SO4 provides 2 H 's whereas each HCl just 1.
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.
Next you should describe briefly some methods for following the reaction = measuring the speed of the reaction.
Also whilst changing the concentration it is vital that all other variables remain consistent throughout the experiment.
Gcse Chemistry Coursework On Rates Of Reaction
I will not be using room temperature as I cannot control it and this could cause improbabilities within my investigation. Middle 25cm3, 20cm3 etc from the burette into a test tube * Next measure out the amount of water that was needed e.g. * Put both of the test tubes into a test tube rack.
Hence, these results show that an increase in concentration increases the rate of a reaction.
As you can see, the greater the concentration of the acid used in a reaction the steeper the curve and the shorter the reaction time.
* Next take both of the substances out and put the beaker on top of the cross on a piece of paper, pour both the water and the Sodium Thiosulphate into the beaker.
* Start the stopwatch once you have poured in both substances.