Chemistry 2210A/B Lecture Notes - Lecture 5: Ice Crystals, Nitric Acid, Sulfuric Acid
12 Dec 2017
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The two forms of chlorine react with each other to produce molecular chlorine, which is released as a gas: Sunlight returns: the sunlight photo chemically decomposes cl2 and (and any hocl released from the ice crystals) into atomic chlorine, cl, cl2(g) + sunlight --> 2 cl. (g, hocl (g) + sunlight --> oh. + cl: deconstruction of ozone by the cl. follows, mainly by mechanism ii. Inactive forms of chlorine return only after the pscs and the vortex disappear: then the ozone destroying reactions cease. Why is no clono2 formed: denitrification is the loss of nox species, the no2(g) is deposited as hno3(s) and is not available to react to form clono2. Large crystals of hno3 fall down to the troposphere. In addition, the ice particles melt, so no more chlorine activation can occur: the result is that the ozone hole closes for another year and the normal cycle of chemistry can happen.
