Investigating the rates of reaction of Sodium thiosulphate and hydrochloric acid :: GCSE Chemistry Coursework Investigation

Investigating the counts of reaction of atomic number 11 thiosulphate and hydrochloric acid use my preliminary experiments I decided on using the following utensil- A conical Flask- A hang on of White writing marked with a black cross- Dilute hydrochloric acid- Sodium thiosulphate- Water- Measuring cylinderWe must produce a piece of coursework investigating the rates ofreaction, and the effect different changes remove on them. The rate ofreaction is the rate of loss of a reactant or the rate of institution ofa product during a chemical reaction. It is measured by dividing 1 bythe clock time taken for the reaction to take place. There be four factorswhich affect the rate of a reaction, according to the collision possibilityof reacting particles temperature, concentration (of tooth root),surface are (of solid reactants), and atom smashers. I have chosen toinvestigate the effect concentration has on a reaction.This is because concentration is the virtually practical to inves tigate asit would take longer to prepare a solid in powdered and unpowderedform, and it is difficult to get accurate readings collectible to theinevitabilities of human errors, and as bobble is mostly colourless it isdifficult to dope a reaction changing the pressure, and if asubstance is added to give the gas colour, it may influence theoutcome of the experiment.Also temperature is difficult to sustain and be made exact for all theexperiments.Similarly the use of a catalyst complicates things, and if usedincorrectly could alter the outcome of the experiment.All other factors up to now must be kept constant while we are alterthe concentration.Both the sodium thiosulphate and the Hydrochloric acid are soluble inwater, so the concentration of either can be changed. However I havechosen to vary the sodium thiosulphate as it is available in bigamounts, and various concentrations are prepared.I provide time how long it will take varying concentrations of SodiumThiosulphate to reac t with the Hydrochloric acid so that the solutionwhen placed above the white paper with the black cross is so reactedthat one cannot see the cross through the opaque liquid.In effectuate for my findings to be valid the experiment must be a beauteousone. I will use the same standard each time for judging when the X hasdisappeared. I will make sure that the quantity cylinders for the HCland thiosulphate will not be mixed up. The amount of HCl will be 5 cm3each time, and the amount of thiosulphate will be fixed at 20 cm3.Also room temperature will be used as the temperature as it ispractical and will not need to be monitored.