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Investigation Into The factors which Affect The Rate Of Reaction Between Sodium Thiosulphate And Acid

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Introduction

Investigation Into The factors which Affect The Rate Of Reaction Between Sodium Thiosulphate And Acid An acid and the Chemical Thiosulphate undergo a reaction on contact i.e. Sodium Thiosulphate + Hydrochloric acid ??Sulphur Dioxide + Sodium Chloride + Water Na2S2O3(aq) +2 HCL(aq) ?S(s) + NaCl(aq) +H2O(l) In this reaction solid sulphur is precipitated and the sulphur dioxide produces remains in solution. The object of the investigation is to investigate different factors that will change the rate of the reaction. I will ensure the safety of the experiment by wearing safety goggles and an apron. Instead of pouring the acid/ sodium thiosulphate straight into the measuring cylinder but by pouring some into a beaker first so that when I DO pour the acid/ sodium thiosulphate into the measuring cylinder it will be easier to manage as it will be lighter, thus making a spillage more unlikely. ...read more.

Middle

The volume of precipitate will be decided by how long it takes a cross to be non-visible to the human eye. I will place a cross behind a boiling tube and then pour the acid into the sodium thiosulphate and watch until the cross disappears from my sight (when a certain amount of precipitate has been produced). I will time how long this take and record my results in a table. I will repeat the experiment twice each and then change the concentration. I will reduce it by 5 cm3 each time, however each time I will add 5 cm3 of water to dilute the acid, lower the concentration and keep the total volume the same for a fair test. ...read more.

Conclusion

marble chips) as there is more area TO hit. Increasing the concentration increases the amount of particles in a solution (i.e. there are fewer particles in a 1-molar/litre acid than a 2 molar/litre) this increases the chance of a reaction as there are more particles to react with. I predict that as the concentration of the acid lowers, so will the rate of the reaction. This is because as there are less particles to react with as the concentration decreases (the acid becomes more diluted) so there will be less chance of the particles 'bumping' into each other. I base these predictions on the Collision Theory. Equipment I will use the following items: 2x boiling tube 1x beaker 1x measuring tube Hydrochloric acid Sodium Thiosulphate Water ?? ?? ?? ?? Peter Edmonds 11Lr, 11J1 Dr. Smith. ...read more.

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