Rate of Reaction Coursework :: GCSE Chemistry Coursework Investigation

An experiment to find the set out of reply between two liquidsIntroductionThis is an experiment to determine the effect of changing theconcentration of sodium thiosluphate (Na S O (aq)) on the rate ofreaction between sodium 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 i were to place hydrochloric acid and sodium thiosulphate into abeaker a white cloudy solution is left in the beaker. The rate of thereaction can be controlled by concentrating one of the liquids, or onecould add water to dilute the mixture to slow the reaction.Method ApparatusTwo beakers of 50cm3Sodium ThiosulphateHydrochloric acidConical flaskMeasuring tube-10cm3Measuring tube-50cm3The setup is set up as shown above. I will place 50cm3 of SodiumThiosulphate I will keep Hydrochloric acid at a ageless rate of5cm3. Then I will reduce the sodium thiosulphate and increase thewater, for example50cm3 0cm340cm3 10cm330cm3 20cm320cm3 30cm310cm3 40cm3When the reaction is complete 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 same pieceof paper. The room temperature will be kept constant because I willmake sealed 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 sanctify for the sodium thiosulphate and Hydrochloric acid to reacttheir specks must* Collide with each other* The collision must have enough energyThis is shown by the explanation down the stairsThe 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 successful collisions thereare in a given unit of time.There are three main ways of speeding up a reaction* ever-changing the concentration