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    I'm aware that a buffer consists of a weak acid and the salt of said weak acid.
    So surely CH3CH2COOH (equib sign) CH3CH2COO- + H+ would be able to mop up any added H+ or OH-? Why does there need to be the dissociation of, say, CH3CH2COONa->CH3CH2COO- + Na+ to form the CH3CH2COO-???


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    (Original post by Mutleybm1996)
    I'm aware that a buffer consists of a weak acid and the salt of said weak acid.
    So surely CH3CH2COOH (equib sign) CH3CH2COO- + H+ would be able to mop up any added H+ or OH-? Why does there need to be the dissociation of, say, CH3CH2COONa->CH3CH2COO- + Na+ to form the CH3CH2COO-???


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    You are correct in what you say... BUT if you only have the weak acid then there are very few anions available to 'mop up' any added hydrogen ions and so the pH will decrease considerably on addition of acid.
 
 
 
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