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How Concentration Affects The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid

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How Concentration Affects The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid The rate of reaction is a measure of the change, which happens during a reaction in a single unit of time. 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 The factor that we are using is Concentration of the reactants. 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 equation to this is as follows: Sodium +Hydrochloric = Sodium +Sulphur +Sulphur +water Thiosulphate Acid Chloride Dioxide Na2S2O3 (aq) +2HCL (aq) = 2NaCl (aq) + S(s) +SO2 (g) + H20 (l) Aim: We did 6 experiments to find out how the rate of reaction changes with differing concentrations of Sodium Thiosulphate, Hydrochloric Acid and water. ...read more.


Firstly, we drew a black cross on a white piece of paper. Then, we put 10 cm3 of hydrochloric acid in a conical flask (measuring the HCL with a small meniscus), and then put the conical flask on the black cross on the paper. We then added 25 cm3 of Sodium Thiosulphate to the hydrochloric acid, and at this time we do not need to add any water. Immediately, we started the stopwatch. We then waited for the black cross to be completely obscured by the mixture. When this happened we stopped the stopwatch. By this time the mixture was completely yellow. Then we recorded what the time was. We then emptied out the contents of the conical flask, and cleaned it out, and dried it. Next, we added 20cm3 of Sodium Thiosulphate; we kept the HCL acid constantly at 5 cm3. Now, because we have to keep the volume the same for it to be a fair test, we added 5 cm3 of water. ...read more.


To do this it is a lot easier if there are two people doing the experiment, so one person can put the two substances in the HCL, and one person can start the stopwatch. Another thing we must do is to make sure that the conical flask is completely clean and free of any water or any other substance before we attempt to start the next experiment. Safety There are a lot of safety issues we must abide by in this experiment also. We must remember that the substances that we use in this experiment can be very harmful if used the wrong way. When we do this experiment, it may be necessary to wear safety goggles, as things are very unpredictable, and even though it is very unlikely that the solution would come out of the conical flask during the experiment, one must still be cautious of spills. We should also try our best not to spill any chemicals, and we must not eat or drink in the lab while dealing with these harmful chemicals, as they can get on to our hands. ...read more.

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