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# Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

For this piece of coursework I am going to investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. Here now is the EQUATION representing Sodium Thiosulphate and Hydrochloric Acid being reacted together. Na2 S2O3 (aq) + 2HCL (aq) 2NaCl (aq) + H2O (l) + SO2 (g) + S(s) Sodium Thiosulphate + Hydrochloric Acid Sodium Chloride + water + sulphur dioxide + sulphur Background theory Here now is background theory on Rates Of Reactions There are four factors, which depend on the Rate Of Reaction. The Collision Theory states that all of these factors create more collisions between the particles, which therefore increases the Rate of Reaction. These Four Factors, which affect the rate of reaction, are: 1. Temperature: 200C will produce products at a lower speed compared to that of 400C. Higher Temperature's allow for the particles to move faster to search for a collision so there are more collisions. Also as the collisions are more energetic, more collisions have an energy greater than the initial energy or activation energy which means the reaction will be faster. LOW TEMPERATURE HIGH TEMPERATURE 2. Concentration: In solutions of higher concentration the particles become closer together which means there is a more chance of particles colliding with the other particles which increase the number of collisions. This also happens gases at higher pressures. ...read more.

Middle

Also the containers we are using should be checked that they are not damaged as they may cause spillage. Also in the lab where the experiment will take place bags and stools should be tucked away to avoid any accidents, the environment in where we shall carry out the experiment should be clear with no obstructions. Fair test As I am doing this experiment I will have to keep it a fair test. This means that the variables will have to be kept the same each time which means the amount of acid will be have to be the same. Also when I am repeating the experiment I will have to wash the flask out thoroughly or use a new one so then there is no excess solution otherwise this may cause an unfair experiment. All of these precautions will make my final results more reliable and keep anomalies at a minimum so therefore make the entire investigation more successful. Accuracy To make my results as a whole more accurate I shall repeat the experiments so then I know that if my results are similar then the evidence is more reliable because in the first experiment an error may have occurred. Also the accurate measurements of solutions should be used. I shall ensure this by using clear measuring cylinders and double check each time that the right amount of solution is added each time. ...read more.

Conclusion

The alterations that could been made are: * Using different conical flasks each time as washing them took some time whereas using a new one each time would allow for continuous work through the experiment without the need to stop which could cause an error and also using new flasks each time would create no concern whether or not there is any excess solution left in the flask after each experiment * The use of pipettes would have been very useful because the substances were poured in to a measuring cylinder then in to the conical flask, using pipettes I would have been able to drop the substances much more precisely using the correct amounts which will minimise any unfamiliar results or errors * A light sensor device could have been used. Using this device would have been very helpful because the device connects to a computer along with a data logger, which would automatically measure and stop the time for the light and cross to disappear. This is a very accurate way of measuring the time because the device would immediately stop automatically whereas using a stopwatch could cause errors such as: If the watch is not stopped straight away (because it takes a least a second to look when the reaction is completed and to stop the clock) Or forgetting to stop the clock, which will result in that reading or the experiment having to be done again. James Patney 11U Chemistry Coursework ...read more.

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