Investigating the reaction between Sodium Thiosulphate and Hydrochloric acid!

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Sodium thiosulphate and hydrochloric acid react together and form sulphur. The rate of reaction can be formed by seeing how long it takes this solid to form. We can find this out by carrying out several experiments. I will watch for a cross under the reaction, taking place in a conical flask to disappear, this will be timed (dependent variable). Sulphur is a yellow solid and so will cloud the solution. I aim to change the concentration of the sodium thiosulphate by adding water (independent variable) whilst keeping the amount of acid used constant for each experiment. The room temperature, total volume of sodium thiosulphate and water, volume of hydrochloric acid, type of flask and volume it holds all need to be kept the same, these are called the control variables.

I predict that as the water amount (independent variable) increases and the sodium thiosulphate amount decreases the time taken in seconds will also increase, by this I mean the last experiment will take a lot longer than the first experiment because it involves using more water.

(Give detailed and well explained scientific theory to back up your prediction; the theory must be correct and relevant! Don't forget to include relevant equations).

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The apparatus I intend to use are crosses, stop clocks, pipettes for each acid, conical flasks and measuring cylinders, one of 10cm and one of 50cm . By using three of the same thing (crosses, stop clocks and conical flasks) the experiment will be made quicker.

(Diagram)

Repeat each experiment three times each; start by setting out all the apparatus appropriately so they are easy to get to. Fill each conical flask with 10cm of acid using the 10cm measuring cylinder and pipette if needed then measure out the water and sodium thiosulphate using the 50cm measuring cylinder, use a different pipette to make measurements more accurate. Once all substances have been put into a conical flask, start the stop clock immediately. You should let the same person start and stop the stop clock for each experiment and the same person watch for the cross, underneath the conical flask to disappear. I will take measurements for 8 different volumes of sodium thiosulphate in the range of 10 to 50cms. I chose to start my experiment with 10cm of sodium thiosulhate because any lower, I know will definitely not react quickly enough. Because I will use a 50cm measuring cylinder my highest concentration will be 50cm of sodium thiosulphate. I think these values will give me accurate results to plat my graph.

To ensure that the measurements are as reliable as possible I will repeat the readings times to check for anomalous readings and to improve the reliability of the data. I will then plot the graph. Also by using a pipette to make measurements more accurate in the practical will give me results that are more precise.

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