The Reaction Between Hydrochloric Acid and Sodium Thiosulphate

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The Reaction Between Hydrochloric Acid and Sodium Thiosulphate Introduction ============ I am investigating how different concentrations of thiosulphate and distilled water in ratio to 10cm³ of hydrochloric acid affect the rate of reaction. I will also investigate if there will be a change in temperature after the reaction has occurred. I will know when the reaction is taking place as the solution turns from clear to opaque. The reaction that takes place is as follows: - Sodium + Hydrochloric à Sulphur + Sulphur + Sodium + Water Thiosulphate acid dioxide chloride Na S O + 2HCl à S + SO + 2NaCl + H O ------------------------------------ The reaction will have finished when the solution has turned completely opaque and it is visible that the solution is not turning increasingly more so. At atomic level, at this point all of the particles in the solution will have stopped colliding. My prediction I predict that as the concentration of distilled water to sodium thiosulphate increases, the rate of reaction will take longer as the distilled water is making the solution weaker. This is due to the fact that there will be less fruitful collisions between sodium thiosulphate and the hydrochloric acid. This can be easier described by using the following diagrams: - Here there are many successful collisions between the sodium thiosulphate and the hydrochloric acid because there is a large volume of sodium thiosulphate in ration the volume of water, meaning that the water cannot dilute the solution to a great enough extent. Here there is no where near as many successful collisions as seen previously. This is because there is a larger volume of water in ration to the volume of sodium thiosulphate, meaning that there will not be as many sodium thiosulphate molecules that would be able to collide successfully. Due to this collision theory, the higher the concentration of sodium thiosulphate, the quicker the rate of reaction because there will be more successful collisions happening in a shorter space of time.

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