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The effects of concentration have an effect on the rate of reaction.

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Introduction

INVESTIGATING THE EFFECTS OF CONCENTRATION AIM: To find out how the effects of concentration have an effect on the rate of reaction. PREDICTION: I predict that the more Sodium Thiosulphate there is, the faster the reaction will take place with the Dilute Water and the Hydrochloric Acid, there are more Sodium Thiosulphate molecules and less dilute water molecules for them to collide into. However, if there are more Dilute water molecules, the rate of reaction will be slower, because the more dilute it is, the less concentrated the solution is. The decrease of concentration will take longer for the rate of reaction because there are fewer molecules for the Sodium Thiosulphate to collide into. APPARATUS: Dilute Water 0.15M Sodium Thiosulphate 2M Hydrochloric Acid 10 cm3 Measuring Cylinder 50 cm3 Measuring Cylinder Stop clock Glass Beaker Safety Goggles METHOD: Measure 50cm3 of Sodium Thiosulphate. Pour this into the conical flask. Then, measure 10 cm3 of Distilled Water and add to conical flask. Finally, measure 10 cm3 of Hydrochloric Acid and add to the conical flask. ...read more.

Middle

I also predicted that for the reaction to take longer you would use more dilute water molecules, as this will slow the reaction down because there aren't many Sodium Thiosulphate molecules for the dilute water molecules to smash into together with and to break the Sodium Thiosulphate bonds. From the 1st graph, I've noticed that on the line representing the average tells us that on the first and second point it is nearer to test 2s result. As all three lines start rising, we can know see that the third average point is above both of the lines representing the two tests. On the fourth and fifth point on the average line, it decreases below test 1 and the line representing line 1 increases rapidly. On the second graph, the points representing test 3, test 4 and the average are quite close together for the 0-50, 10-40, 20-30 concentration. As the points reach the 30-20 concentrations on the graph the points start to spread out and at 40-10 the points are spread out even more. ...read more.

Conclusion

This would tell us if we had more Hydrochloric Acid than Dilute Water, would it take quicker or longer for the Dilute Water to break the bonds. If I did this experiment, I think that, the more Hydrochloric Acid there is with less Dilute Water; the reaction will take place faster because the Hydrochloric Acid will be stronger and it will take longer for the Dilute Water to break the Hydrochloric Acid bonds. After this I would do the experiment again to but change the Dilute Water to Warm Dilute Water to see whether the changes have a big difference or a small difference to the outcome of the experiment. This would show whether Hydrochloric Acid has an effect on the rate of concentration. To improve the experiment I would make sure that the solutions were measured out accurately and I would also make sure that we clean the conical flask thoroughly after each test, so no contents from the last test remains in the next test, this is so that the test can be fair. Furthermore, I would set out the equipment appropriately, so that it is easier to know where all the chemicals and apparatus's are. Sonya Patel 28/03/03 102 10E 1 ...read more.

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