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An Investigation Into The Factors Affecting The Rate Of A Reaction: The Write Up Of An Experiment Using Sodium Thiosulphate And Hydrochloric Acid

2964 words - 12 pages

Skill Area P: PlanningWhat I going to investigate is how different factors affect the rate of the chemical reaction of Sodium Thiosulphate and Hydrochloric acid. In which a precipitate is formed and causes the solution to become opaque. They react as in the equation below:Sodium Thiosulphate + hydrochloric acid -->; sodium chloride + sulphur + sulphurdioxide+WaterNa2S2O3(aq) + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l)I plan to change the concentration of the Sodium Thiosulphate by diluting it with water but I plan to keep the same volume of liquid in the beaker to ensure that it is a fair test because the volume of liquid in the beaker may affect the reaction time. Also in order to make it a fair test I am going to keep the following variables the same: the temperature; the volume of the hydrochloric acid; the same distance between the light sensor and the solution; the same distance from the light source and the solution; the voltage going into the light bulb; same concentration of acid; same beaker and apparatus; and the same total volume.I have identified the following hazards and I will deal with them as shown below:Hazard 1: Dealing with Acids -- I will wear safety specs to protect my eyes and care will be taken while handling the acid.Hazard 2: Electrical Equipment - I will not touch the electrical equipment while handling liquids and care will be taken to make sure that all electrical equipment will not come into contact with liquids.METHODEquipment:A beakerComputerLab-PakLight Source (I used a 6V bulb)(Surround the light with a ring of black cardboard to focus the lightLight sensor (again surround the sensor with black cardboard to irradiate light from other sources)SyringeBuretteClamp standSodium ThiosulphateHydrochloric AcidFirstly I set the computer up and loaded the software, which I used to record the data. I then attached the light sensor onto the clamp stand and also attached it to the computer. After that I attached the beaker to the clamp stand the same distance away from the light sensor each experiment and made sure that the light source fitted underneath the beaker and that I could pour the liquids into it without hassle. I then placed the light source directly underneath the light sensor and beaker, and attached it to a Lab-Pak as a supply of electricity. I then started preparing for the experiment. I used a syringe to measure 10ml of Hydrochloric acid for each experiment. And I also used 2 burettes one for water the other for Sodium Thiosulphate; I poured these separately and then mix them together in the beaker attached to the clamp. Once everything was ready, I poured the hydrochloric acid into the SodiumThiosulphate and my partner placed a marker on 'Log-it Lab' to show when I had had put the hydrochloric acid in, so that we could work out the length of time it took for the light level to drop 40%. The experiment was repeated three times.When planning my investigation I made use of the following scientific...

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