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Na25203 Investigation

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PLANNING: We have to produce a coursework, which investigates the rates of reaction, and the effects of different changes have on them. There is five factors which affects the rate of reaction, according to the collusion theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. In this experiment we have to see how quickly the sodium thiosulphate and water turn milky and the effects that happen. I can tell when it goes totally cloudy when the cross is no longer visible. The reaction that will be used is: Na25203 (aq) + 2HCL (aq) ? 2NACL (aq) + H2O (l) + SO2 (g) + S (s) Sodium + Hydrochloric ? Sodium + Water + Sulphur + Sulphur Thiosulphate acid chloride dioxide Both the sodium thiosulphate and the hydrochloric acid are soluble in water, so the concentration of either can be changed. ...read more.


Because of my prediction I think that my graphs will be a negative correlation. 1) This test tube has no water so this means it is easier for the reaction to take place. 2) In this test tube there is some water so this delays the reaction from taking place. 3) In this test tube there is a lot of water, this water blocks the sodium thiosulphate and the hydrochloric acid from reacting. I will measure the time it takes for the sodium thiosulphate to react with the hydrochloric acid. I will also observe how long it will take for the sodium thiosulphate to turn milky. I will change the amount of sodium thiosulphate and water of the solution. The Hydrochloric acid will stay the same. To make my experiment a fair test I will do the following: * I will make sure that the measuring cylinders for the HCL and thiosulphate will not be mixed. ...read more.


This increases the time for the solution to get milky. My prediction was the following: 'The more dilute the solution is the longer it will take to get cloudy' this prediction is right. EVALUATION I am trying to find out the rate of reaction and the effect that different changes have on it. My method was good. I altered the amount of water and sodium thiosulphate in my experiment. I made it a fair test by using the same standard each time for judging when 'x' has disappeared. I made sure that the measuring cylinders for the HCL and thiosulphate were the same so that they do not get mixed up. I kept the Hydrochloric acid the same all the way through the experiment. I measured the time it took for the sodium Thiosulphate and Hydrochloric acid to react together. I used measuring cylinder and a conical flask. I think washing and drying the flask thoroughly through each interval could have improved the experiment. ...read more.

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