Concentration And Reaction Rate :: essays research papers

How concentration affects response rate.The aim of this investigation is to see how the concentration of a reactant in ratio to the reactor affects the rate of a reaction. When hydrochloric acid and Thiosulphate react together sulphur is liberated this nitty-gritty that as the reaction goes on the response will become yellow and will change from being transp bent to translucent to opaque. The sulphur is formed as a solid but non in the usual precipitation way.Na2 + S2 + 2HCL 2NaCl+SO2 + S2 +H2O To time the reaction I will draw a black cross on a snatch of plain paper on which the beaker of reactants will be placed (HCL and Thiosulphate). When the chemicals come into contact with each other I will start timing with a stopwatch and will stop timing when the cross is longer visible through the beaker from above.A reactionA chemical reaction between to chemicals arsehole only happen if their molecules can collide into each other. Out of many collisions there will be a few successf ul collisions, which means that the ii molecules will exchange electrons and that means that they sire reacted. These molecules have to hit each other in the right direction and at the right speed in short the rules for a successful collision are specific and complex. But if the number of collisions per second increase so will the number of successful collisions increase. This means that the rate of the reaction has increased. For a reaction to occur you also need the required activation competency which means that if there isnt enough the reaction wont take place although catalysts can lower this. Input VariablesCatalystConcentration of acid or thiosulphateTemperatureLightTemperatureIf you increase the amount of energy in a group of molecules the reaction rate will increase. When you give energy to molecules they tend to move about a bit more. And this means that if they are moving rapidly from place to place they are going to have a lot more collisions and because they are havi ng lots of collisions the chances are that they will have a successful collision a lot more quickly than if they werent.This basically means that reaction rate is increased as temperature increases.I deliberate that temperature is directly proportional to reaction rate.As you can see the graph is partly true to the above statement but gradually starts to curve off, this is because at a point the intense temperature will start to boil the liquids which means they will start to evaporate and concentration will be affected.