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An Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration.

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Introduction

An Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration. Introduction In this experiment I am going to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration. The things that affect the rate of reaction are as follows: � Surface area of the reactants � Concentration of the reactants � The temperature at which the reaction is carried out � Light � Use of a catalyst Method At the start of the experiment we drew a black cross on a white piece of paper. We then put 5 ml of hydrochloric acid in a conical flask (measuring the HCL acid with a syringe, for accuracy) and then put the conical flask on the black cross on the paper. We then added 50 ml of sodium thiosulphate to the hydrochloric acid, and at this time we did not add any water. Immediately after adding the solution we started the stopwatch. We then waited for the black cross to be obliterated by the cloudy solution. When this happened we stopped the stopwatch. We recorded how long it took for the solution to become opaque. We then emptied out the contents of the conical flask, and cleaned it out, and dried it. Next, we added 45 ml of sodium thiosulphate; we kept the HCL acid constantly at 5 ml. ...read more.

Middle

If Swallowed: Wash out mouth, give glass or two of water. Seek medical attention. Do not induce vomiting. If Vapour inhaled: Move victim to fresh air seek medical attention if breathing affected. If liquid gets in eyes: Flood the eye with gently running tap water for 10mins, seek medical attention. If spilt on skin or clothes: Flood the area with large quantities of water. Remove contaminated clothing. If large area is affected or blistering occurs, seek medical attention. Sodium Thiosulphate Harmful if ingested in quantity. Make sure room is well ventilated. If Swallowed: Give plenty of water. Seek medical attention. If substance gets in eyes: Do same as with hydrochloric acid. If split on skin or clothes: Remove contaminated clothing. Wash skin with plenty of water. Soak contaminated Clothes and rise repeatedly. If someone does hurt they then assess the situation carefully. Do not put yourself at risk check safety. If he/she is unconscious then put the person in the recovery position as shown. Call for help immediately, and call for an ambulance. Research Colloids are important in this experiment because the reaction between Sulphur and hydrochloric acid forms a 'colloid', which makes the solution go cloudy. When you use a higher concentration the amount of colloids colliding goes up which means that the rate of reaction is speeded up. ...read more.

Conclusion

This might have been due to basic human error of misinterpretation of time, or maybe because we measured the substances inaccurately. The only other possibility is that the apparatus were not cleaned properly in between testing. Generally the results gathered have enabled me to complete the experiment. I found it hard to be able to tell when the cross, had disappeared (having to judge by human eye). I think a more accurate way of doing this experiment would be to use a light gauge. The light gauge would measure accurately when the solution reached the same degree of cloudy-ness in all repetitions. This would make the experiment much more fair because the same would apply throughout. There are a number of ways in which we could have made the results more reliable e.g. by being more thorough in the cleaning of the apparatus and using the light gauge. If I were to redo this experiment, I would change two variables, not only the amount of sodium thisulphate but also the amount of hydrochloric acid. This would give more interesting data to analyse. The reaction times would also be greatly increased making the reaction time shorter so more weak concentrations can be looked at but without taking so long. In general I am pleased with the outcome. I enjoyed doing this investigation as it let me look in depth at how reactions take place. Previous to doing this experiment I lacked knowledge of colloids and found this interesting. Science Investigation ...read more.

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