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Concentration - Rates of reaction.

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Concentration - Rates of reaction Aim The aim is to see how the concentration of hydrochloric acids effects the rate of reaction with sodium thiosulphate. Introduction A rate of reaction is how fast or slow the reaction is between two chemicals. There are five ways which effect the rate of reaction, they are:- Catalyst Enzymes - If there was more catalyst enzymes the quicker the reaction is. Temperature - If the temperature is high it will give the particles more energy which will make them collide more. Surface Area - So there is more of the reaction substance exposed because if there was a big surface area there will be more space for the reactions to happen. Concentration - By increasing the concentration there are more particles what will collide. ...read more.


Prediction I think that the higher the concentration of hydrochloric acid with the sodium thiosulphate will make the rate of reaction will be faster than a lower concentration of hydrochloric acid which will make the rate of reaction slower. That will mean that there will be more particles in the solution will means that they will collide more to make a reaction between the two substances. After we have done the experiment we will make a results table to see if my prediction is correct. We will also be putting together graphs to show the results better. From the two trials I did and put into the table I will be able to compare the two sets of results to see if they are right, and to see if my prediction is right. Formulae 2HCl(aq) + N2S2O3 --> S(s) + SO2(g) + NaCl(aq) + H2O Method 1. ...read more.


When the hydrochloric acid was 2.0M that was when it was the quickest time to react. I only had a couple of anomalies which didn't fit into my line of best fit. Evaluation The procedure that we used worked well but we did find a few problems when we did the experiment. For example when we collected the hydrochloric acid and the Sodium Thiosulphate we disagreed if the right amount of the acid was in the measuring cylinder. And the other problem was when the chemicals had reacted together we disagreed when it was time to stop the clock. We could sort out them problems by just one person deciding if there was the right amount of hydrochloric acid or Sodium Thiosulphate in the measuring cylinder and then another person can decide when the two chemicals have reacted together. The two trials which we did compared well because the times of the reactions were near enough the same there was no big differences between them. ...read more.

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