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My aim's to find out what effect hydrochloric acid has on marble chips.

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Introduction

Aims My aim's to find out what effect hydrochloric acid has on marble chips. I'm going to look at what will effect the reaction rate and explore the collision theory to help me in my research. I will use different amounts of acid to see if this will effect the reaction rate. I will also look at my results to see if the reaction rate would change if i were to dilute the hydrochloric acid by increasing the amount of water. I want to find out at what point the reaction will be at its highest rate. I will do this by consulting my graph and looking at the gradient. How will I make my test fair? To make sure that the test is done as accurate and as fair as it can be I will: Not change the amount of marble in each test this is because I want to make it consistent. I will change the amount of water this will show if a weaker acid will change the reaction rate. ...read more.

Middle

Start the timer and at the end of the time record the volume of gas released. My predictions I predict that the more concentrated acid that is added to the marble will have the greatest effect on the reaction rate. By increasing the amount of water to the acid solution, the weaker it will be and so this will produce less of a reaction. Also as my work on the collision theory show the more surface area there is then the more collisions and the better the reaction could be, and if I was to increase the temperature this would cause more energy and produce more collisions. Results table This is my table of results I have shown the two lots of experiments that I have done. (the second in pink) marble acid time water volume 1a 1.07g 25cm3 4.20 0cm3 100ml 1b 1.07g 25cm3 4.20 Ocm3 100ml 2a 1.05g 20cm3 4.20 5cm3 86ml 2b 1.05g 20cm3 4.20 5cm3 94ml 3a 1.08g 15cm3 4.20 10cm3 57ml 3b 1.08g 15cm3 4.20 10cm3 65ml 4a 1.09g 20cm3 4.20 15cm3 25ml 4b 1.09g 20cm3 4.20 15cm3 23ml 5a 1.10g 25cm3 ...read more.

Conclusion

My graph shows that there is a straight line, I can use the gradient of the line to show where the reaction rate is best. This shows a positive correlation and proves that my method is right. So I can prove that the higher the concentration the higher the reaction rate. To improve the accuracy of this experiment I could use a water bath to keep the temperature constant could also use a more accurate measuring method such as a burette. The marble could be crushed this would also allow more surface area and would be more the same size. Conclusion To conclude to my experiment I will show my results and what I have found. I have found out that as my evaluation says the more acid added to less water will create a more reactive reaction rate and more gas will be produced as a result of this. This is why when there is less acid and, more water there is less gas produced because the reaction rate had less energy and so there were less collisions and so an slower reaction so less gas would be produced. ...read more.

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