Rates of Reaction :: GCSE Chemistry Coursework Investigation

The affect of varying hydrochloric acid concentration of on the stride of reaction with sodium thiosulphateBackground knowledgeThe equation of this reaction is Na2S2O2+ 2HCl 2NaCl + piss + SO2+ S A reaction is a process by which a mental object orsubstances pitch to produce a new substance or substances. Rate ofreaction is the speed at which products are organise and reactantsdisappear during a chemical reaction. The rate will be deliberate byfollowing the production of sulphur. The rate of reaction is affectedby temperature, surface area, concentration and catalysts. These arethe affecting factors. In a reaction, the particles of the reagent must(prenominal) come together and collide before the reaction can sorb place.This is called the collision theory, particles must collide beforethey can react, and the colliding particles must check enough energyto cause bonds to brake.Apparatus* Beaker* Log its cast down pulse* substructure* black card* syringe* glass delivery tube* tripod* bill cylinder* stop watchMethodWe decided to use a loggits light beatnik to follow the precipitationof sulphur on the land that the light passing by dint of the solutionwould decrease in tawdriness as the reaction proceeds. We will firstlycover the beaker with card, leaving a 2cm opening at the bottom of thebeaker to allow light to pass through the solution. secondly we wouldplace the loggits light meter directly above the beaker (the meterwill have the bottom half of it covered with the card to embarrass anyalien light from affecting the light intensity of the light passingthrough the water)PreliminaryAfter the first trial we had to change the way in which we covered thebeaker with the black card because we found that the derive of lightpassing through the solution from all angles was uncontrollable,because we were using a natural source of light (the sun). Instead ofleaving a 1cm gap from the bottom of the beaker, our solution was tocover the whole beaker and cut 2 arches, 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 to reach out a constant source of light. The Initial light intensity interpreting will be between 40% and 45%.Procedure tonus 1) Set up the stand to hold the log its light meter above thebeaker (fig i). Then place the beaker beneath the meter. Form ashield from the surrounding light by using the black card, doing soby forming a cone around the beaker and the bottom half of the light