Criterion B Acid rain Air pollution is a problem in our society. Pollutant gases such as sulphur dioxide and oxides of nitrogen when they dissolve in rain produce sulfuric acid and nitric acid. These acids change the pH of rain water to between 3.2 to 5.0, a phenomenon known as acid rain. Acid rain is responsible for some of the damages to buildings. In addition to standard laboratory equipment you are provided with the following chemicals and construction materials o o o o o o o acid rain test tubes limestone concrete zinc aluminium iron Design a method to investigate the effect of acid rain on the integrity of building materials. In your answer you should include: • • • • • your research question. the independent, dependent and control variables a list of equipment you will use a description of the method you will use to collect sufficient data and make suitable measurements. a statement of how you will make sure your method is safe.
