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Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Sodium Thiosulphate and Hydrochloric Acid In this experiment I am going to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration. The equation to this is as follows: Sodium + Hydrochloric = Sodium + Sulphur + Water Thiosulphate Acid Chloride Dioxide This reaction usually produces a yellow precipitate. The conical flask holding the solution is placed on a sheet of paper with a black cross drawn on it. When the cross is completely obscured, the reaction will have finished. The time taken for this to happen is the measure of the rate of reaction. The experiment is repeated as the concentration of sodium thiosulphate is changed. This is done by diluting the sodium thiosulphate with water. The things that affect the rate of reaction are as follows: ? Surface area of the reactants ? Concentration of the reactants ? The temperature at which the reaction is carried out ? Light ? Use of a catalyst Independent variable - concentration of the reactant (thio) ...read more.

Middle

This can easily be done with two people. Also, the conical flask should be completely clean and free of any water or any other substance before the next experiment is started. Safety We must remember that the substances, which we use in this experiment, can be very harmful if used the wrong way. When we do this experiment, it may be necessary to wear safety goggles, as things are very unpredictable, and even though it is very unlikely that the solution would come out of the conical flask during the experiment, one must still be cautious of spills. We must make sure that coats and bags are all out of the way while doing the experiment. Ties and hair should be tucked out of the way, so they do not make contact with any of the chemicals. It would also be preferable to wear a scientific apron, however this is not essential. We should also try our best not to spill any chemicals, and we must not eat or drink in the lab while dealing with these harmful chemicals, as they can get on to our hands. ...read more.

Conclusion

109 104 106 0.009 25 25 10 192 137 187 172 0.006 This is the only anomalous result that I have recorded. The result may have turned out anomalous because of basic human error, or maybe because we measured the substances wrong. It may have even been because we did not clean the apparatus properly. Apart from this, the accuracy of my experiment has been more or less accurate. Although there are a number of ways in which we could have made the results more reliable. For instance, we could have used better measuring equipment, because the apparatus we used was mainly basic equipment. Another thing we could have done to bring more evidence is to have tried to use the hydrochloric acid as the variable substance, and used the sodium thiosulphate as the constant substance. This would have brought more evidence to support the idea that the higher concentration of a substance, the faster it will react. I think that the evidence, which I have received, is enough to reach a suitable conclusion. My prediction was right. The higher the concentration, the faster the reaction. ...read more.

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