Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid :: Chemistry Coursework Investigation

Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid AimInvestigation, to find step forward how the rate of reaction between SodiumThiosulphate and Hydrochloric acid is affected by changing theconcentration.IntroductionI must produce a piece of coursework study the rate ofreaction, and the effect different changes have on them. The rate ofreaction is the rate of loss of a reactant or the rate of developmentof a harvest-tide during a chemical reaction. It is measured by dividing 1by the time taken for the reaction to take place. There is fivefactors which affect the rate of a reaction, according to thecollision theory of reacting particles temperature, concentration (ofsolution), pressure (in gases), surface area (of solid reactants), andcatalysts. I have chosen to investigate the effect of concentration onthe rate reaction. This is because it is the most practical toinvestigate. Dealing with temperatures is a difficult task especiallywhen we have to keep constant high temp eratures. Secondly the rate equivalence and the constant k changes when the temperature of thereaction changes. We have no gases and solids involved therefore it iseasy to deal with solutions. Similarly the use of a catalystcomplicates things, and if used falsely could alter the outcome ofthe experiment.The theory behind this experiment is that Increasing theconcentration can increase the rate of the reaction by increasing therate of molecular collisions. graphI result place the reaction mixture on a paper with a vague cross-drawnon it. When the cross is completely obscured, the reaction will havefinished. The time taken for this to happen is the measure of the rateof reaction. We must do this several times, and change theconcentration of Sodium Thiosulphate.The rate of reaction is a measure of the change, which happens duringa reaction in a single unit of time. The things that affect the rateof reaction are as follows Surface area of the reactants meanness of the reactants The temperature at which the reaction is carried out Use of a catalystReaction equation is mentioned above but rate equation could only be distinguishable by doing experiments. So the following procedure can be usedto carry out the experiment.PlanEquipment 2 Measuring cylinders Beaker Stopwatch Paper with black cross on it Sodium Thiosulphate (different concentrations) Hydrochloric acid (same concentration each time) Water (different concentrations) PipettePredictionI predict that the greater the concentration of Sodium Thiosulphate