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Reaction times of Sodium Thiosulphate and Hydrochloric acid

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Reaction times of Sodium Thiosulphate and Hydrochloric acid Introduction I am going to perform an experiment involving sodium thiosulphate and hydrochloric acid. The experiment is to see how fast the two of them will react. The reaction which will be taking place is this: Sodium Thiosulphate + Hydrochloric Acid = sodium chloride + water + sulphur dioxide + sulphur Na2 S2 O3 (aq) + 2H Cl (aq) = 2Na Cl (aq) + H2 O (l) + S O2 (g) + S I am going to do this by placing a piece of paper underneath the conical flask with a cross drawn on to it with permanent marker and by using a stopwatch seeing how long it will take for the cross to disappear. The cross disappears because as the sodium chloride is produced it dissolves into the water making it go cloudy. I will be changing the temperature of the hydrochloric acid but I am not going to change the temperature of the sodium thiosulphate. ...read more.


Particles with more energy are more likely to overcome the "activation energy barrier". So if the temperature is increased more the particles will move faster and collide into other atoms successfully with effective collisions. Method 1. Set up the equipment as shown in diagram above. 2. Measure 25cm( of sodium thiosulphate and hydrochloric acid. 3. Pour sodium thiosulphate into conical flask. 4. Pour 25cm( of hydrochloric acid into the test tube and place into the water bath. 5. Heat up acid until desired temperature each time ascending by 10(C each time . Do first result at room temperature. 6. Take out test tube with the acid in and pour into conical flask. 7. Start the timer at the exact moment you put in the acid. 8. Stop the timer when the cross has disappeared. 9. Record results. 10. Repeat until you have 5 results then perform the experiment again two more times. ...read more.


Even though this would have happened for all of the results. Another reason is because of the change in room temperature. This may have been caused because of the bunson burner heating the room up every time I did the experiment at room temperature it would be different. I could have changed this by heating up the sodium thiosulphate as well. One thing to consider is that if the experiment was carried out and one of the chemicals ran out the concentration even though it may say that it is 2 molar may be slightly different to the original chemical. This may result in a set of results having a greater difference than the previous set of the results. This can be stopped if you make sure there is enough of each chemical at the start of the experiment or if you do run put you will have to start the investigation again. ?? ?? ?? ?? Vincent Clegg ...read more.

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