Chp6_Kab - constants in terms of concentrations, namely...

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Calculating K for an acid base reaction Given a general acid-base reaction of the form: reacting acid + reacting base = produced base + produced acid e.g. HCN NO CN HNO + + - - 1 2 1 2 the equilibrium constant for the acid-base reaction, K, can be expressed in terms of acid- dissociation constants by: ) ( ) ( acid produced K acid reacting K K a a = [ ] [ ] [ ] [ ] - - - - = × = × × = 1 2 1 2 6 10 4 10 0 . 1 10 0 . 4 10 0 . 4 CN HNO HCN NO K Please note that this formula is inverted from our usual way of thinking of equilibrium
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Unformatted text preview: constants in terms of concentrations, namely products over reactants. One can derive this expression from the respective Kas. [ ] [ ] [ ] 2 1 3 1 2 2 ) ( HNO O H NO HNO K a +- = [ ] [ ] [ ] HCN O H CN HCN K a +- = 1 3 1 ) ( Divide these as above and see that one gets K for the net acid-base reaction....
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This note was uploaded on 03/29/2009 for the course CH 201 taught by Professor Warren during the Fall '07 term at N.C. State.

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