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# Rate of reaction between marble chips and acid.

Extracts from this document...

Introduction

Rate of reaction between marble chips and acid. Introduction In this experiment I will be testing the rate of reaction of marble chips and acid. The by-product is CO2 and we will be testing how much CO2 is given off. The marble chips are made out of limestone (CaCO3) with one of the two acids available: Hydrochloric (HCL) and Sulphuric (H2SO4) Factors The factors that could affect the rate of reaction of my experiment are as follows: � Concentration of acid This could affect the rate of reaction because the higher the concentration of the acid then the more acid particles per 40cm3 so more collisions per second and then there will be more successful collisions per second. � Temperature of the acid If the starting temperature of the acid is different each time the speed at which the acid particles collide with the marble chips will increase more the higher the temperature goes. This means the acid particles move with more energy, which means they will collide with the marble with more energy, which will give more successful collisions per second. � Surface area of the marble chips If the marble had a bigger surface area each time the experiment was done, then the acid particles will have a bigger area to collide with, so more collisions will occur every second and the more collisions per second than the more successful collisions per second. � Type of acid used If you changed the type of acid then the rate of reaction would change. ...read more.

Middle

This means that there will be more collisions per second, which means there will be more successful collisions per second, so the rate of reaction will increase. If I double the concentration of the acid from 1M hydrochloric acid to 2M hydrochloric acid then I will expect to see the rate of the reaction double. This is because there are twice as many acid particles in 2M hydrochloric acid than in 1M hydrochloric acid, so there will be twice the amount of collisions per second and because there are twice the amount of collisions per second then there will be twice as many successful collisions per second, increasing the rate of reaction. From my prelim work it would be suitable to take a reading every 30 secs and gain a suitable graph and firm conclusions. Fair Test In order to keep my experiment a fair test I will have to make sure that I keep the following factors the same: � Starting temperature of the acid � Volume of acid used (cubic centimetres) � size of magnesium I will also have to make sure that the gas syringe is correctly connected and that it is placed quickly and tightly enough so that no hydrogen gas escapes. Observations Molars are as follows: 2M = 40ml of acid 1.5M = 30ml acid- 10ml of water 1.0M = 20ml each 0.5M = 10 ml of acid- 30 ml of water 0.0M = 40ml of water Molar/ time 0 secs 30 secs 60 secs 90 secs 120 secs 150 secs 180 secs 2 0 18 30 ...read more.

Conclusion

The results that I did collect were reliable as I repeated the experiments twice to obtain good average results. My results were not only reliable they were reproducible. The results I produced were reliable enough to base my conclusions the experiment was successful as a whole but had errors the experiment could be done again and my conclusions would still be the same although the figures would be more accurate. Further work I could use sulphuric acid. This is a dibasic acid and its molecular build-up is H2SO4 and hydrochloric acid is 2HCL, because of this I would obtain different results. I could also use phosphoric acid, which is a tribasic acid, and its molecular build-up is H3PO4, I would also obtain different results if I used this type of acid. Nitric acid is a monobasic acid but its molecular build-up is HNO3, which is very similar to the molecular build-up of hydrochloric acid so the results that I would obtain from using this acid would be similar to the ones I already have, so I would not use this for any further experiments. The reason I could use a different type of acid for any further work is to find if the is a difference between them if their molecular build up is different. I also could improve this experiment by making sure the surface area was the same. my surface areas where the same approximately but I could have made this more accurate by using cubic chips where the surface areas where known. This way it will make the example eevn more accurate than it was. ...read more.

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