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# Investigate how the change in concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid

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Introduction

Investigate how the change in concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid Introduction I am trying to find out how the change in concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid. I predict that the higher the concentration of sodium of thiosulphate, the quicker the rate of reaction will be between the two substances. The scientific reason for my prediction is due to the collision theory. The collision theory is, that in order for chemicals to react they must come into contact with each other (collide). However, not all collisions result in chemical reactions as sometimes the particles just bounce off each other. The particles must have sufficient energy when they collide to react. If you increase the number of collisions, you increase the rate of reaction. Therefore, a higher concentration means a greater number of collisions. Diagram Preliminary Testing This is the word equation for the reaction between the two substances: Sodium + Hydrochloric Sodium + Sulphur + Sulphur + Water Thiosulphate Acid Chloride Dioxide Na2S2O3 + HCl NaCl + SO2 + S + H2O ( aq ) ...read more.

Middle

Use a burette to measure the amounts of the solutions needed, and put them into separate beakers. Using a funnel at the top of the burette to pout the solution into. After firstly using a measuring cylinder to measure the solution. Use a stopwatch to time how long it takes for the cross underneath the conical flask to disappear, as the solutions are mixed together. As the reaction turns the two colourless liquids, into a milky colour afterwards. Repeat the procedure with different amounts of the solutions, working out the best amounts that I could use for experiment. These are the results that I received: Amount of H2O ( cm3 ) Amount of sodium thiosulphate ( cm3 ) Amount of hydrochloric acid ( cm3 ) Time Taken ( seconds ) 0 50 50 41 0 10 40 160 0 5 45 165 These preliminary testing results helped me to decide that I am to investigate the changing concentration of sodium thiosulphate as the time it takes to react, increases as the volume of it decreases. ...read more.

Conclusion

The reason why I have chosen this range of measurements is that the time it takes to react needs to be as accurate as possible. This is why I have chosen to use this measurement, as it is more accurate than minutes, also the quickest of the reactions will take place inside of one minute. I found this out during my preliminary tests as the quickest reaction, which was the most concentrated solution, reacted in only 41 seconds. I intend to take 5 results with a different concentration of sodium thiosulphate in each. The reason why I need to take this number of results is so that I am able to see if there is any pattern to set of results. Moreover, I will repeat the result twice so that I have more than one set of results. In case of any other results not being totally accurate due to a mistake within the investigation. Therefore, by repeating the results I can make sure of the results. ?? ?? ?? ?? Simon Sharp 5 More Mr Valentine ...read more.

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