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Skill Area P Planning What 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 --gt sodium chloride sulphur sulphur dioxide Water Na2S2O3aq 2HClaq -gt 2NaClaq Ss SO2g H2Ol 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 METHOD Equipment A beaker Computer Lab-Pak Light Source I used a 6V bulbSurround the light with a ring of black cardboard to focus the light Light sensor again surround the sensor with black cardboard to irradiate light from other sources Syringe Burette Clamp stand Sodium Thiosulphate Hydrochloric Acid Firstly I set the computer up and loaded the software which
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