4. The pH of normal rainwater is approximately 5.6. The slight acidity compared to pure water (pH7.0) is caused by dissolved CO2, as per the following reaction: CO2(aq)+H2O10H2CO3(aq) In some regions of the world, the acidity of rain has increased to a pH of approximately 3.5. This is caused by the presence of polluted air containing SO2,SO3, and NO2. These oxides react with rainwater to form acids, further lowering the pH. SO2+H2OH2SO3SO3+H2OH2SO42NO2+H2OHNO3+HNO2 With the lower pH, there is a higher proportion of bicarbonate present. Calculate the ratio of bicarbonate to carbonic acid in A) normal rain water (pH5.6) and in B) acid rain ( pH3.5)(4pts)