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# The effect of concentration on the rate of reaction of sodium thiosulphate.

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Introduction

THE EFFECT OF CONCENTRATION ON THE RATE OF REACTION OF SODIUM THIOSULPHATE AIM: My aim is find out what effect would hydrochloric acid (the reactor) have on sodium thiosulphate (the reactant). PREDICTION: The higher concentration of acid, the faster rate of reaction with sodium thiosulphate. My reasoning for this is that the more acid particles in the acidic solution there are, the more particles will collide with the sodium thiosulphate particles, and the more collisions there are, the quicker pace of rate gets. In essence, I predict my results would be, the concentration being directly proportional to the length of time EQUIPMENT: the equipment I will need for this experiment is: * Flask * Beaker 6 * Measurement tube 2 * Timer * Pipette 2 * Funnel * Piece of paper with cross METHOD: as you can see on the previous page how everything is set out. I will be explaining the method in stages: 1. Firstly, I will get a measuring tube pour 20cm3 of the acidic solution into it using a pipette, and then pour that into the beaker. I will then pour sodium thiosulphate into the other measuring tube and measure it to also 20cm3. ...read more.

Middle

For concentrations we had to work out the volume of solution for each experiment. Here are the concentrations given in table format: Mole Concentration of: 1.Acid 2.Water 2M 20cm3 0cm3 1.8M 18cm3 2cm3 1.6M 16cm3 4cm3 1.4M 1.2M 14cm3 12cm3 6cm3 8cm3 1M 10cm3 10cm3 M=mole, which the means the units used for the concentration of acid. FAIRNESS: I will make the test fair by measuring the solution of both, sodium thiosulphate and the acid is of 20cm3 and no less. As for the temperature C, that will be at room temperature C. SAFETY: To make this test safe I will conduct this experiment as far as possible from the edge, so nothing spills. Also I will have goggles on at all times for the protection of my eyes. SECONDARY SOURCES: the secondary sources I used in this investigation will be listed in bullet point form: * www.gcsechemistry.com * CGP Double Science Award book * Chemistry Nelson Science * www.chlor-chemicals.com/Products/HCl/hclint.htm RESULTS: CONCENTRATION TEST 1(SEC) TEST2 (SEC) 2M 38.97 37.03 1.8M 39.61 38.13 1.6M 40.73 41.45 1.4Ms 43.1 41.9 1.2M 42.5 44.5 1M 44.1 44.91 As you can see from the results that each section has two results. ...read more.

Conclusion

I could have also taken another set of initial results, but It would have to have been 15 second, as more time passes the longer time it takes to react as there is less to react with.. that would have given me even more accurate readings to a certain extent. If I went further with this experiment, I would try and find out how much concentration of acid it would take to react with one gram of sodium thiosulphate. To work it out I would either have to use the method of trial and error, or work out how the gas given off is linked with what I need to work out. If I did do this experiment successfully I would've shown how long it would take for one gram to react. The usefulness with this would be that we would know how much acid to put in and not waste any, as an added bonus, the solution should become neutralised, as there would be only enough particles to react with enough sodium thiosulphate, so the acidic and calcium particles should react and go, therefore leaving water which is not harmful either. The downside would be, if you were testing the speed, the more acidic particles there are, the more area they cover, therefore reacting with the reactant much quicker. ...read more.

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