• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Acid rain - With this experiment we want to show how gases that are dissolved in water will turn the water into an acid.

Extracts from this document...

Introduction

Acid Rain Investigations Date of experiment: March 20, 2003 Written by: Berit Nielsen 2.i Partners: Mary Rasmussen Dmitri Kern Introduction With this experiment we want to show how gases that are dissolved in water will turn the water into an acid. Materials and method For the experiment we used the following: Medicine dropper demineralised water 2 beakers with lid bromothymol blue graduated cylinder 2 test tubes matches lead nitrate, Pb(NO3)2 First we added a few drops of the indicator, bromothymol blue, to 10 mL of dem. water in a test tube until the water became slightly blue. Then we placed a match in a clean beaker and lighted it. ...read more.

Middle

Observations When we added bromothymol blue solution to the beakers, they turned yellowish. In the second experiment the fumes were brown. Explanation The chemical reactions taken place when lighting the match and heating the lead nitrate, were: S(s) + O2(g) ? SO2(g) 2Pb(NO3)2(s) + O2(g) ? 2PbO(g) + 4NO2(g) + 2O2(g) Since the colour changed from blue to yellow when we added bromothymol blue, we know that an acid is present in both experiments. What caused these changes to occur was the oxides of sulphur and nitrogen. The reason why we can see these changes is because we have added demineralised water and the indicator bromothymol blue. ...read more.

Conclusion

4HNO3(aq) Sulphur dioxide occurs naturally from volcanoes. It is produced industrially from the combustion of sulphur containing fossil fuels and the smelting of sulphur ores: S(s) + O2(g) ? SO2(g) In the presence of sunlight sulphur dioxide is oxidized to sulphur trioxide: SO2(g) + 1/2O2(g) ? SO3(g) The oxides can react with water in the air to sulphuric acid: SO2(g) + H2O(l) ? H2SO3(aq) and SO3(g) + H2O(l) ? H2SO4(aq) Conclusion and evaluation We have made a model of how gases can dissolve in water to make water more acidic. We have also found out how acid rain is formed. The experiment was successful. To improve the experiment knowing more exact amounts of each reactant would be preferable, e.g. the amount of sulphur in the match, in order to do some calculations and achieve some precise numbers which could be compared with official limits etc. 1 ...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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. The effect of Acid Rain on Seed Germination.

    Experiment 4: These seeds germinated the best out of the four. All 20 of the seeds germinated and grew to an approximate length of 70mm and 16 of the shoots had developed a cotyledon. The shoots were also healthy and very green in colour.

  2. Acid Rain

    (Bown, 1990:152) 5.3 Use alternative energy sources There are other sources of electricity besides fossil fuels. They include: nuclear power, hydropower, wind energy, geothermal energy, and solar energy. Of these, nuclear and hydropower are used most widely; wind, solar, and geothermal energy have not yet been harnessed on a large scale in Australia.

  1. Formation and Effects of Acid Rain.

    The MEDC's themselves would try and stop this happening or force them to change to renewable sources for their energy. The MEDC's would have many problems trying to implement these ideas upon the growing LEDC's though. Looking at countries pasts we know that all cities have grown and will grow a lot more in the future.

  2. Acid rain in Europe

    Also liming is very expensive and has to be repeated every two to five years for it to be effective.

  1. An experiment to see how much sugar can be dissolved in different volumes of ...

    I am doing it at this amount because then I have a greater scale to work with and from my preliminary testing I found that adding greater amounts meant that I couldn't tell when the sugar really stopped Dissolving, doing it at this amount ensures I am able to.

  2. Determination of the proportion of nitrogen in a fertiliser.

    Therefore, 1 mole of NaOH is equivalent to 14.01 grams of nitrogen. So in order to find out the proportion of nitrogen in the fertilizer we must find out the exact amount of nitrogen (in grams) in the fertilizer. To do that, we need to find out how many moles of NaOH is being used.

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