Rates of Reaction :: GCSE Chemistry Coursework Investigation

The affect of varying hydrochloric unpleasant concentration of on the footstep of reaction with sodium thiosulphateBackground cognitionThe equation of this reaction is Na2S2O2+ 2HCl 2NaCl + H2O + SO2+ S A reaction is a process by which a substance orsubstances change to state a new substance or substances. Rate ofreaction is the belt along at which products are formed and reactantsdisappear during a chemical reaction. The account will be measured byfollowing the production of sulphur. The rate of reaction is affectedby temperature, surface area, concentration and catalysts. These arethe bear upon factors. In a reaction, the particles of the reagentmust come together and collide sooner the reaction can take place.This is called the collision theory, particles must collide to begin withthey can react, and the colliding particles must contain enough energyto cause bonds to brake. machine* Beaker* Log its giddy measure* stand* opaque card* syringe* scratch delivery tube* tri pod* measuring cylinder* stop watchmethod actingWe decided to use a loggits light meter to follow the hasteof sulphur on the basis that the light passing through the ancestorwould decrease in intensity as the reaction proceeds. We will firstcover the beaker with card, leaving a 2cm gap at the idler of thebeaker to lead light to pass through the stem. Secondly we wouldplace the loggits light meter directly above the beaker (the meterwill have the bottom one-half of it cover with the card to prevent anyalien light from affecting the light intensity of the light passingthrough the water)Preliminary later on the first trial we had to change the way in which we covered thebeaker with the black card because we found that the amount of lightpassing through the solution from all angles was uncontrollable,because we were victimisation a natural source of light (the sun). rather ofleaving a 1cm gap from the bottom of the beaker, our solution was tocover the wholly beaker and cut 2 a rches, so that we could direct therequired amount of light into the specific area of the beaker.Secondly we will use a lamp, covered with 2 sheets of A4 paper toachieve a constant source of light. The sign light intensityreading will be between 40% and 45%.ProcedureStep 1) Set up the stand to accord the log its light meter above thebeaker (fig i). Then place the beaker on a lower floor the meter. Form ashielding from the surrounding light by using the black card, doing soby forming a cone around the beaker and the bottom half of the light