Rate of Reaction Coursework :: GCSE Chemistry Coursework Investigation

An experiment to find the rate of answer between devil facilesIntroductionThis is an experiment to determine the effect of changing theconcentration of atomic number 11 thiosluphate (Na S O (aq)) on the rate of moveion between atomic number 11 thiosulphate and hydrochloric acid (HCL (aq)).HCl+sodium thiosulphatearrowsodium chloride+sulphurdioxide+sulphur+water.HCl(aq) + Na2S2O3(aq) arrow NaCl(aq) + SO2(g) + S(s) + H2O(l)If one were to pop out hydrochloric acid and sodium thiosulphate into abeaker a white cloudy event is left in the beaker. The rate of the reply can be controlled by concentrating one of the liquids, or onecould add water to stretch out the sort to slow the reaction.Method ApparatusTwo beakers of 50cm3sodium ThiosulphateHydrochloric acid conical flaskMeasuring tube-10cm3Measuring tube-50cm3The apparatus is set up as shown above. I bequeath place 50cm3 of SodiumThiosulphate I will limit Hydrochloric acid at a constant rate of5cm3. Then I will reduce the sodiu m thiosulphate and increase thewater, for example50cm3 0cm340cm3 10cm330cm3 20cm320cm3 30cm310cm3 40cm3When the reaction is sleep together the solution left should be white andcloudy, to test this I will place a piece of paper with a cross onit. If I cannot see the cross on the paper then the reaction hasfinished.Constants* Hydrochloric acid* Temperature* Length of X on paper* Room temperatureVariables Sodium thiosulphate WaterHydrochloric acid will be kept at a constant rate because theexperiment is about changing the concentration of sodium thiosulphate.The temperature will be kept constant with a precise thermometer inthe solution. The paper with the X on it will always be the selfsame(prenominal) pieceof paper. The room temperature will be kept constant because I willmake sure the windows are closed.Sodium thiosulphate will be varied because that is the point of theexperiment. The water will be varied to dilute the reaction.Scientific explanationIn order for the sodium thiosul phate and Hydrochloric acid to reacttheir particles must* Collide with each other* The collision must get down sufficient energyThis is shown by the explanation belowThe particles in the liquid If the collision has enough If thecollision move around continually. energy, a reaction takes place doesnot have here an acid particle is enough energy about to collide with a no reaction sodium atom occurs. The acid particle bounces away again.If there are a lot of collisions then the rate of the reaction isfast. If there are not many, the rate is low.The rate of a reaction depends on how many fortunate collisions thereare in a given unit of time. on that point are three main ways of speeding up a reaction* Changing the concentration