Rate of Reaction :: Papers

Rate of Reaction Aim: To watch and keep record of the effects of a change in concentration on the rate of reaction. Word equation: Hydrochloric Acid + sodium thiosulphate ÃÆ'Â   Sulphur dioxide + Sodium Chloride + water 2HCl + Na2S203 ÃÆ'Â   2Na + SO2 + H2O Plan: In this experiment I will be testing the rate of reaction of Hydrochloric acid and Sodium Thiosulphate. The rate of reaction tells us how quickly a reaction happens, so I will increase the concentration of the hydrochloric acid each time I do the experiment, adding ÂÂ ¼ of distilled water to 2 molars of the acid therefore providing us with the concentrations 2, 1.5,1,0.5 and finally 0 to react with the acid. I will do a pretest first to see if the amounts of acid and Sodium Thiosulphate work and to see if there won't be any anomalous results. Equipment: Diagram of equipment: 2x beaker 4x conical flask 2x measuring cylinders Funnel X board Stopwatch Prediction: I predict that each time we increase the concentration of the Hydrochloric acid the amount of time it will take to react will decrease because the stronger the acidity the quicker it will react with the Sodium Thiosulphate as the more concentrated the acid solution the more successful collisions occur. The rate of reaction is how quickly the reaction happens and a reaction happens because of collisions between the reactants. [IMAGE] Concentration: this is the factor I'm going to study I will use the concentrations 0mol, 0.5mol, 1mol, 1.5mol and 2mol. Temperature: This has big effects on the rate of reaction because the hotter the reactants are the faster they react, this is because the molecules of the reactants move around more and faster so collide more often and quicker, as they collide they react, therefore as according to the collision theory the reaction is sped up. Catalysts: catalysts lower the activation energy of a reaction so with