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Horvath Practice Problems 62

Horvath Practice Problems 62 - 15THE COMMON ION EFFECT AND...

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15THE COMMON ION EFFECT AND BUFFERS It is important to consider an acid dissociation reaction (or base reaction) in which a compound that contains one of the productionsisadded HA ­ H + + A add H + or A . By LeChatelier’s principle the reaction is shifted back towards the reactant. This shift in the equilibrium by LeChatelier’s principle is called the common ion e f ect . Example : How does the equilibrium shift when 10 mL of 0.010 M HCl is added to 25 mL of a 0.10 M niacin (HC 6 H 4 NO 2 ) solution ( K a =1 . 4 × 10 5 )? We
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