17 - Water 2a - General controls on water chemistry General...

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General’controls’on’water’chemistry:’ General’water’chemistry’determined’mainly’ by’atmospheric’inputs,’weathering’products,’ and’ subsequent reac,ons during transport .’
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Andrews’et’a.,’2004’
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Andrews’et’a.,’2004’
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Andrews’et’a.,’2004’
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Brownlow,’1996’
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Andrews’et’a.,’2004’
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Andrews’et’a.,’2004’
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Solubility’of’a’mineral’ Mass’of’the’mineral’that’will’dissolve’in’a’unit’ volume’of’soluEon’under’speciFed’condiEons’ When’water’comes’into’contact’with’ minerals,’they’begin’to’dissolve’unEl’the’ equilibrium’concentraEons’are’reached’or’ unEl’minerals’are’consumed’
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Ex.’Mineral’anhydrite’ CaSO 4 (s) ’<->’Ca’ 2+ (aq)’ +’SO 4 2- (aq)’ Can’defne’an’equilibrium’constant’(K)’For’the’reac±on.’²or’mineral’solubility’this’is’ reFerred’to’as’the’solubility’product’constant’(K sp )’ K sp ’has’one’value’at’a’given’temperature’and’pressure’ Values’can’be’Found’in’tables’and’are’determined’experimentally’or’theore±cally’ (using’thermodynamic’rela±onships)’ dissolu±on’ precipita±on’
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K sp ’=’[Ca’ 2+
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