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Investigating the effect of tempreture on the reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Investigating the effect of tempreture on the reaction between sodium thiosulphate and hydrochloric acid. Procedure Method I will mix together 10cm3 of sodium thiosulphate to 40cm3 of distilled water .Put them in to a beaker and heat to the desired temperature. Measure out 5cm3 of hydrochloric acid and put in to a conical flask. Add the sodium thiosulphate and water, when all the solution is in the conical flask that is the indication to start the stop clock. Put the flask over a piece of paper with an x marked on it. When you can no longer see the x ( will turn cloudy) that is the indication to stop the stop clock. I repeated this 3 times at different temperatures. ...read more.

Middle

The higher temperature causes the atoms to vibrate faster which can cause the bonds holding them together to break. The Apparatus I will use will be: My aim in this experiment is to find which concentration of sodium thiosulphate is suitable for this experment. If the concentration of sodium thiosulphate is to strong the reaction will take place to fast and will be hard to take accurate results, this also applies if the concentration is to week. I will change the concentration of the sodium thiosulphate by adding distilled water. The amount of sodiumthiosulphate at any concentration has to equal 50cm3 For this experiment I will be using: 10cm3 of sodium thiosulphate (40 grames per liter) 40cm3 of distilled water 5cm3 of hydrochloric acid I will chose a sutible number of measurements to take readinds in reaction tomes and to show clearly on graphs. ...read more.

Conclusion

The apparatus I will use will be as accurate as possible. I will use burette instead of a measuring cylinder. The burette is accurate 0.1cm3 out of 50cm3.The measuring cylinder are a lot less accurate. All of the cylinder varies in accuracy. I will repete the experment 3 times to gain a accurate result. My results My results are as follows Temperature c? Time (1) Seconds Time(2) Seconds Time (3) Seconds 70� 15.2 16.3 14.5 60� 30.3 32.4 29.1 50� 45 49 47 40� 60.8 64.5 61.5 30� 94.3 98.7 102.6 20� 168 175 182 Rate of reaction Tempture c? Rate of Reaction (1) Rate of Reaction (2) Rate of Reaction (3) 70� 0.065789 0.06135 0.068966 60� 0.033003 0.030864 0.034364 50� 0.022222 0.020408 0.021277 40� 0.016447 0.015504 0.01626 30� 0.010604 0.010132 0.009747 20� 0.005952 0.005714 0.005495 Results Results Andrew Larman 1 ...read more.

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