Sulfuric acid (H2SO4), derived from SO2, plays a major role in acidifying the atmosphere. This acid contributes to aerosol formation and increases the acidity of rainwater and cloud droplets.

and add to boiling water. Allow solution to cool to room temperature and add 0.8gNaHSO3 (sodium bisulfite) and 10mL of 1M H2SO4 (sulfuric acid). Dilute to 1L. NOTE: Solution B is stable for ...