The Reaction Between Hydrochloric Acid And Sodium

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To investigate the effect of concentration on the time of reaction between two chemicals: hydrochloric acid (HCl) and sodium thiosulphate (Na2 S2 O3). Introduction In the experiment I am going to investigate the reaction between sodium thiosulphate and different concentrations of hydrochloric acid and how long does this take. I want to find out if the more concentrated the hydrochloric acid does this make the speed of reaction slower or faster? Or does it have no effect? This is the equation of the reaction. (Clear) (Clear) (Soluble) (Gas) (Yellow precipitate) (Clear) (Clear) (Soluble) (Gas) (Yellow precipitate) Sodium thiosulphate + hydrochloric acid → sodium chloride+ sulphur dioxide + water + sulphur This makes the solution go cloudy This makes the solution go cloudy Na₂S₂O₃ + 2HCl → 2NaCl + SO₂ + H₂O + S Variables There are different things that we had to control during the experiment to ensure the results were reliable, we had to keep the temperature the same, although this was not 100% accurate because we did it at room temperature and we doubt that this would have changed within the 30 minute experiment time. The X that we were looking at during the experiment had to be the same X on the same piece of paper to eliminate any changes of the X, we also had to make sure the distance we kept between the piece of paper and the person who was looking the same, we did this by leaning our arms on the table and looking vertically down without bending our backs at all. We thought it was best to use the same person so the visual ability to see the X

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