The relationship between the concentration of Sodium Thiosulphate and the reaction rate with Hydrochloric acid :: GCSE Chemistry Coursework Investigation

The descent between the concentration of Sodium Thiosulphate and the reception tempo with Hydrochloric acidIntroductionThe rate of response is measured by finding the quantity of productmade in a certain time. The rate of response can be made faster by anincrease of temperature, adding a catalyst, increasing concentrationor pressure or making the reactants surface body politic larger. An increasein temperature causes the particles of the reactants to gain much elan vital and ingrain faster. Collision theory states that this results inmore collisions and more of these collisions will have enough energyto cause a chemical reaction. By adding a catalyst the particles will stick tothe sides of the catalyst and this increases the rate of reaction. Byincreasing the surface ara there is more surface for the particles tocollide with thus causing more collisions and increasing the rate ofreaction. Finally by increasing concentration there are more particles moving around in the same space. This equals more reactions, whichequals faster rate of reaction.More collisions = faster rate of reaction.In this experiment I shall be examine the relationship betweenthe concentration of sodium thiosulphate and the rate of its reactionwith Hydrochloric acid. The formula for this reaction isHydrochloric acid + Sodium thiosulphate Sodium chloride +Sulphur oxide + Sulphur + water2HCL(aq)+Na2S2O3(aq)NaCl(aq)+SO 2(g)+S(s)+H2O(l)The reaction is considered to be over when sufficient cloudiness isbuilt up in the reaction flask. This cloudiness is sulphurprecipitated from the reactants. This therefore is a precipitationreaction. We are investigating the effect of varying the concentrationof Sodium Thiosulphate and not the other variables that can affectrates because We do not know the right catalyst for this reaction, weare not able to break the reactants down to increase their surfacearea and we decided not to do temperature because we felt that themost dramatic results would come from concentration. To give rise this testfair all of these other variables have to remain the same.Hypothesis----------I believe that the less concentrated the Sodium Thiosulphate theslower the rate of reaction will be. I say this because the less theconcentration the less the amount of particles in the same volume andtherefore the less collisions. This means that the rate of reactionwill be slower.Plan----To obtain our results we will be using the following equipmentConical flask (To contain the liquids whilst the reaction is takingplace.)Pipette (To move reactants and measure out precise amounts.)Goggles (As we are using acid our eyes must be shielded from harmfulmaterials)Apron (To protect the frock and body.Stopwatch (To count the time taken for the reaction to take place.