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MARS 1010 Marine Chemistry

MARS 1010 Marine Chemistry - MARS 1010 Marine Chemistry...

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Unformatted text preview: MARS 1010: Marine Chemistry29/10/2007 09:48:00 H20: The Universal Solvent • Recall the polar nature of water. Ionic bonds are easil broken in water because of the polar nature of water, polar water molecules surround individual ions to dissolve them. o The ocean is full of stuff that dissolved in water • “Neutral” pure water is o [H+] is 1 in 10 million or 10^-7 o [OH-] is 1 in 10 million or 10^-7 Brackets mean concentration o PH is –log10[H+] o If [H+] = 10^-7 then pH is 7 or neutral. If greater than (e.g. 10^-5) then it would be pH 5 or acidic. If less than neutral (e.g. 10^-9) then it would be pH 9 or basic. • Carbonate Buffer System: o Bicarbonate (HC03-) changes forms in response to [H+] changes so that the ocean pH is very stable o Changes in atmospheric CO2, however will change ocean pH. o This buffer prevents large or sudden changes in ocean pH. Seawater is a complex mixture of just about every known element....
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MARS 1010 Marine Chemistry - MARS 1010 Marine Chemistry...

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