CHEM 208 Lecture Notes - Lecture 8: Histology, Fluorine, Haloalkane
20 Sep 2016
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When atmospheric carbon dioxide dissolves in water it forms carbonic acid. Co2 (g) + h2o ( ) arrow right h2co3 (aq) The acid formed dissociates partially generating small amounts of hydrogen ions. H2co3 (aq) h+ (aq) + hco3 responsible for the weakly acidic nature of rain. The ph scale : the acidity (a measure of hydrogen ion concentration) of a solution is conveniently described in terms of ph scale. According to this scale, if: ph lower 7: solution is acidic ph higher 7: solution is basic ph = 7: solution is neutral. Field measurements in many areas, on the other hand, show much lower ph values (4. 1- 4. 5). Higher acidity (lower ph) is due to the reactions of nox and sox present in the atmosphere. Various reactions of these oxides lead to the formation of acids. The dissociation of formed acids generates hydrogen ions and hence higher acidity (or lower ph).
