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# Find out whether the concentration of acid affects the rate of a reaction between marble and hydrochloric acid.

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Introduction

Rates of Reaction Aim To find out whether the concentration of acid affects the rate of a reaction between marble and hydrochloric acid. Equipment List 1x conical flask 1x delivery tube & bung 1x test tube 1x water trough 1x safety goggles 1x timer 1x measuring cylinder 10 mls HCl 5g CaCo Diagram Method * I set up the apparatus as shown on the diagram. * The first concentration of acid I HCl I used was 0.25M I added 5g of CaCo (marble) to the conical flask which contained the HCl. * The HCl and the CaCo will react. The gas produced from this reaction will be CO . I know this because I to part in the test for CO . To test for this, you put a lit splint into the test tube of unknown gas and if it goes out its CO or if it pops then it is hydrogen. ...read more.

Middle

This is because the higher the concentration is, the more particles there are in it, so there is a higher chance of it reacting then it with a lower concentration. This is a great example of the collision theory. The following equation will explain my prediction: No. of Moles = Molarity x 10cm� 1000 Analysis Concentration From this investigation I found out that as the concentration of acid increases, the rate of the reaction also increased. The rate of reaction followed a pattern in the other concentrations. The marble began to react quickly and gradually slowed down over a period of 10 to 40 seconds. From my results, I can see that my prediction was correct because as I increased the concentration of acid, I was increasing the number of particals (also known as molarity). The collision theory suggests that when particles collide, they react. ...read more.

Conclusion

A relevant experiment that would work well with the one I have just carried out is the CO /Squeaky pop experiment, where you light a splint and place it inside a test tube of unknown gas. If it goes out its Co . If it makes a pop sound, it is hydrogen. Another experiment which is relevant is the temperature testing of the marble in hydrochloric acid. The point of this is to see if the temperature of the acid affects the rate of reaction. Number of Moles in Each Concentration 0.25m = 0.0025M No. of moles in a solution = Molarity x 10mls (volume) 1000 =0.25m x 0.01 =0.0025M 0.50m = 0.005M No. of moles in a solution = Molarity x 10mls (volume) 1000 =0.50m x 0.01 =0.005M 1.00m = 0.01M No. of moles in a solution = Molarity x 10mls (volume) 1000 =1.00m x 0.01 =0.01M 1.50m = 0.015 No. of moles in a solution = Molarity x 10mls (volume) 1000 =1.50m x 0.01 =0.015M ...read more.

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