• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9

Investigation IntoThe Rate of Decomposition Using Acid Rain.

Extracts from this document...

Introduction

Investigation Into The Rate of Decomposition Using Acid Rain Acid rain is the main cause of erosion on buildings in cities. You are asked to investigate this process and what variables affect the rate of this erosion. Background Knowledge Acid rain is a form of air pollution created from the combustion of fossil fuels; the fossil fuels contain sulphur that forms a gas when burned (Sulphur dioxide). The sulphur dioxide becomes oxidised creating sulphur trioxide, and this then reacts with the moist atmosphere creating sulphuric acid. Sulphur dioxide + Oxygen --> Sulphur trioxide 2SO2(g) + O2(g) --> 2SO3(g) Sulphur trioxide + water --> sulphuric acid SO3 (g) + H2O(l) --> H2SO4(aq) The pH of acid rain is normally around 5.6 yet it has been known to reach a pH of 2.3 which is 1000 times more acidic than pure water, this has happened once in Eastern North America. When the acid reacts with metal hydrogen plus another substance is formed, e.g. Sulphuric acid + Zinc --> Zinc sulphate + hydrogen H2SO4 (aq) + Zn (s) --> ZnSO3 (aq) + H2 (g) When the acid reacts with limestone (the most damaged building material from acid rain) the reaction creates carbon dioxide, calcium sulphate, and water. This is because limestone is calcium carbonate, CaCO3. Calcium + Sulphuric --> Water + Calcium + Carbon carbonate Acid sulphate dioxide 2CaCO3 (s) +H2SO4 (aq) ...read more.

Middle

Also to make the experiment fair we will use the same person stirring and timing the experiment. * Step 1- First set up a burette and carefully measure out the required concentrations of acid into beakers, for each concentration we will have 3 beakers. This will give us an average and it makes the test even fairer because if any anomalous results were gained then we could fall back on the rest of the results. * Step 2- Next we will add the magnesium ribbon to the acid in the beaker. We will time each reaction and record how long each reaction will take from start to finish. We will do this for each of the 3 beakers and then using maths get an average of the 3 readings for all of the concentrations. * Also during the experiment we will stir the solution and keep a thermometer in with the reaction to measure if an exothermic reaction is taking place. Results Concentration of acid ( M ) Time (seconds) Reaction 1 Reaction 2 Reaction 3 Average time Temperature increase (low -->high) 0 (water) No reaction No reaction No reaction No reaction No reaction 0.2 279 251 281 270 18 oc-21oc 0.4 97 89 84 90 20 oc-24 oc 0.6 41 40 39 40 21 oc-23 oc 0.8 27 29 26 27.3 19 oc-21 oc 1.0 18 19 17 18 19 oc-21 oc Analysis Graph 1 shows the relationship between concentration of the acid and the time it takes for the magnesium to dissolve. ...read more.

Conclusion

This may have altered the rate of reaction causing the anomalous result in my second graph. There were other problems like the magnesium sticking to the sides of the beaker or floating to the surface, this means that the whole of the surface area of the magnesium would not have been in contact with the acid throughout the experiment. Some ways to ensure a fair experiment would be to keep the experiment in a room where the heating can be regulated on hot or cold days to a satisfactory level, or an insulated container to maintain a constant temperature throughout the experiment, also we could've used an electronic stirring machine so that the constant stirring may be kept at a good pace without stopping. To make the results even more accurate I could've done more tests to use for a more accurate average reading i.e. use 5 readings per concentration instead of 3. To further the experiment in order to fulfil the brief better I would have to use the average concentration of acid rain instead of using concentrations which are not related to the real world, also I should have been able to use actual building materials with which buildings are made of to get a more true to life experiment. I believe I could've done more with time, as I would've been able to accomplish much more with further experiments and time to think about the processes that occur during the reactions of acid rain. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. What changes can be made to alter the amount of heat produced when magnesium ...

    Kinetic theory is relevant. This is because the molecules in the reaction mixture have a range of energy levels. When collisions occur, they do not always result in a reaction. If the two colliding molecules have sufficient energy they will react. How does surface area affect a chemical reaction?

  2. Rates of reaction of limestone and acid rain

    I decided which temperatures and concentrations to use during my preliminary series of experiments - 1 mol/dm3 of HCl (acid concentration will be fixed) 10-35g/dm3 of sodium thiosulphate (all of these concentrations will be tested in turn going up in steps of 5g/dm3)

  1. Rates of reactivity.

    * In the concentration experiment, extreme caution was exercised when dealing with the hydrochloric acid, as it is very corrosive. Plastic gloves were worn alongside large lab coats and goggles. Apparatus used During all the experiments many different types of apparatus were used.

  2. Factors Affecting the Decomposition of Marble Buildings by Acid Rain

    Also it gives particles more energy, so that when they collide the collisions are more successful. Both these things mean that there is a faster reaction rate. But, if temperature decreases there is a slower reaction rate, as there is less energy.

  1. The purpose of this coursework is to investigate the factors which affect the rate ...

    This process requires energy. For every chemical reaction, there is a certain minimum energy needed in the collisions before a reaction can occur. This minimum energy is called the activation energy of the reaction. The higher the activation energy the less chance there is for successful collisions.

  2. Investigating the reaction that takes place during the thermal decomposition of copper carbonate.

    It is crucial that this experiment is carried out as safely as is possible, therefore protective goggles and lab coats must be worn throughout, long hair must be tied back and care must be taken when handling chemicals. Every action must be carried out with great care to avoid accidents

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work