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How Does Temperature Affect The Rate of Reaction?

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Sodium Thiosulphate Reacts With Acid How Does Temperature Affect The Rate of Reaction? When sodium thiosulphate reacts with hydrochloric acid one of the products is yellow sulphur. The sulphur forms a precipitate in the solution and makes it go cloudy. The chemical formula is shown below: 2HCL + Na2 S2o4 2NaCL + S02 + H2O + S Aim The aim of this investigation is to find out and observe how temperature affects the rate of reaction. I am going to do this by investigating the changes caused to the solution of hydrochloric acid and sodium thiosulphate. I am going to mix hydrochloric acid with sodium thiosulphate and time how long it takes to react at different temperatures. Science Knowledge The rate of reaction is the speed at which a chemical reaction precedes, expressed in terms of the amount of product formed or the amount of unit's time taken for a certain reaction to occur (usually in seconds). Thus for the reaction of two compounds (in this case X and Y) that form a product (Z) the equation would be: X+Y=Z The rate of reaction varies a lot between different reactions. Some, such as explosions, happen extremely quickly (sometimes too quickly for a human to time it accurately) and others like oxidization take place over a much longer period of time. There are several things that can affect the rate of reaction. ...read more.


Temperature is a major factor in this. Increasing or decreasing the temperature changes the movement of particles in a substance therefore changing the rate of reaction. When a reaction mixture is heated up, each particle in it gets more energy and collides more with other particles. Thus, from the research I have collected, I can make the prediction that if you increase the temperature of a particular reaction, you increase the speed at which it takes place. This is simply because the particles carry more energy and collide more often where these collisions contain enough energy to break the energy barrier. Below is a graph of the reaction times: This graph shows us the relation of temperature and rate of reaction. This clearly shows that as the temperature increases then the rate of the reaction also increases. Therefore I can predict that the cross wil disappear quicker, the higher the temperature is. Apparatus For this experiment I am going to need: * Sodium thiosulphate solution (40g/litre) * Hydrochloric acid (2M) * Water * 250 cm� chronicle flask * -5�c - 110�c thermometer * 10cm�/50cm� measuring cylinder * Heat proof mat * Bunsen burner * Wire gauze * Tripod * Stopwatch * White tile * Sheet of plain A4 paper * Pen Trial Experiment For my trial experiment, I did the experiment but did not repeat it five times as I only wanted to make sure that the apparatus I was using was accurate and to familiarise myself with the experiment. ...read more.


Exactly 20cm� of sodium thiosulphate must be used each time as well as exactly 5cm� of hydrochloric acid. These measurements need to be exact to make the experiment fair. Reliable Results To make my results as reliable as possible I am going to repeat each temperature 5 times, ranging from room temperature and 60�c. That is seven different results altogether, from which I can make a good average to plot onto a graph so that I can easily observe and patterns or faults. I will also make sure that each temperature is calculated to as accurate as it can be as recording a result past the required temperature can mean unreliable results which makes the entire investigation unreliable as one result is not calculated correctly. Method 1. Draw a cross on your A4 paper. 2. Measure 20cm� of sodium thiosulphate using the chronicle flask. 3. Measure out 5cm� of hydrochloric acid using a 10cm� measuring cylinder. 4. Heat water bath to the appropriate temperature. 5. When the temperature is correct pour 5cm� of hydrochloric acid into the flask containing the sodium thiosulphate and start the stopwatch. 6. Place over the black cross and shake gently until you can no longer see the black cross. 7. As soon as you cant see the cross stop the stopwatch. 8. Record the time. 9. Repeat 5 times. 10. Do steps 1-10 for each temperature. Steven Livesey GCSE coursework ...read more.

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