Rates of Reaction Investigation :: Papers

Rates of Reaction Investigation You are to plan obtained evidence, correctly presented and use it to draw conclusions and evaluate your work. You are to study the effect of concentration on the reaction of hydrochloric acid and sodium Thiosulphate. This reaction produces a white solid witch clouds the mixture. (The scientific word for this is precipitate.) The gas sulphur dioxide is produced. Prediction: I predict that as the water dilutes the volume of the thiosulphate, it will take longer for it to change into a cloudy mixture. Explanation: The reason why a fink this is because, the lower the concentration the less particles there are to collide with each other. Therefore the rate will be slower in a given time. The reason for this is because the particles are more spaced out throughout the solvent. Equipment: 1 Stop clock 2 Conical flask 3 Sodium Thiosulphate 4 Hydrochloric acid 5 Black ‘X’ on a piece of paper 6 Water 7 Thermometer 8 Measuring cylinders x3 9 Glass beakers x2 To make this a fair test I will keep the hydrochloric acid the same throughout. Method: 1 Collect the equipment and label the beakers ect. So they don’t get mixed up and ruin the test. 2 Get a piece of paper mark and ’X’ and make it look bold so it stands out. Then put the conical flask over it. 3 For the first experiment put 50 ml3 of thiosulphate 10 ml3 of hydrochloric acid and 10 ml3 of water into the conical flask. Repeat the experiment like shown on the results table. 4 Start stopwatch, and mix the contents of the conical flask 10 times in an anticlockwise direction. 5 When the solution turns cloudy, so that you can’t see the ‘X’ stop the stopwatch and record the time. 6 Check and control the temperature to make a fair test. Risk Assessment =============== The first thing I am going to do is look up all the possible dangers