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Investigating the rate of reaction between Sodium Thiosulphate and hydrochloric acid

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Chemistry GCSE Coursework Investigating the rate of reaction between Sodium Thiosulphate and hydrochloric acid Introduction Sodium Thiosulphate + Hydrochloric Acid Sodium + Water + Sulphur + Sulphur Solution Chloride Dioxide Na2S2O3 (aq) + 2HCl (aq) 2NaCl (aq) + H2O (l) + S (s) + SO2 (g) Firstly the rate of a reaction is the rate at which the molecules collide with each other. Below is a diagram of molecules colliding with one another, and the rate of reaction is the amount of a substance that takes part in a chemical reaction in a given time. Chemical reactions happen at widely different rates. Aim To investigate the change in the rate of reaction between sodium thiosulphate and hydrochloric acid while varying the molarities of the sodium thiosulphate, between a specified range and a suitable extent. Investigation I have finally, after my preliminary to use concentration as the variable for my experiment. This is because from 0.2M, we can decrease the concentration and molarity by adding water easily. Temperature requires a lot of set up and equipment. Catalyst requires different types of them, which is quite expensive. I also have a basic knowledge on molarity, and wish to apply it. Also molarity seems to be the hazy one about the effect, even though the explanation seems quite straight forward. I will change molarities, only by decreasing them. ...read more.


* Measure 20ml of 0.2M sodium thiosulphate and 20ml of distilled water from the measuring cylinder. * Measure 15ml of 0.2M sodium thiosulphate and 25ml of distilled water from the measuring cylinder. * Measure 10ml of 0.2M sodium thiosulphate and 30ml of distilled water from the measuring cylinder. * Measure 5ml of 0.2M sodium thiosulphate and 35ml of distilled water from the measuring cylinder. Fair Test To ensure that the test if fair I will control the following; * The person conducting the experiment. This will always be the same, because then the eyesight will be the same and the experiment will be more accurate. * The equipment I will use. All the equipment that I use will be washed after every experiment, and then re-used, so that the results cannot be affected by the varying of each measuring cylinder. * The volumes The volume of the hydrochloric acid will always be 10cm3 and the Thiosulphate and water mixture will always be 40cm3. * The concentration of the acid and the sodium Thiosulphate The concentration will be the same to allow the number of collisions in the reaction to be dependant for just the temperature. * The pressure level This can affect the results, because if pressure is increased the rate of reaction will increase, because the particles are closer together meaning that it is easier for more effective collisions to take place. ...read more.


This may affect the reaction because if the solution is stirred particles can spread out easily and because the particles move further they can collide with other particles. Range of experiments I will do The range of experiments I will do, I have listed in a table below. The acid will stay constant at 10cm3 therefore we can worry less about changing the concentration of the acid and more about changing the concentration of the sodium thiosulphate. This will probably increase the accuracy and reliability of the results making it easier o analyse. Volume of sodium thiosulphate (cm3) Volume of hydrochloric acid (cm3) Volume of water (cm3) 40 10 0 35 10 5 30 10 10 25 10 15 20 10 20 15 10 25 10 10 30 These are the experiments I will do. Approach to reliable results and results of preliminary work Reliable results in any experiment if your doing it fairly should be obtained when you have done repeats for the experiments that way we can identify any anomalies which can then be removed. Also, your results should be compared with other groups of sets of results to check for accuracy and reliability. These are the results of my preliminary work Volume of sodium thiosulphate (cm3) Volume of Hydrochloric acid (cm3) Volume of water (cm3) Average time (Seconds) 40 10 0 24.04 30 10 10 28.69 25 5 0 29.98 20 10 5 43.41 15 5 5 46.03 10 5 10 74.76 These were my results from my preliminary experiments SHAHEEN JOGIAT 10R CHEMISTRY COURSEWORK ...read more.

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