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    bit confused. How do you know when to work out difference in moles (the excess) for both acidic and basic buffers?!
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    The reagent in excess in an acidic buffer is always the weak acid and is always the weak base in the case of a basic buffer, otherwise you would end up neutralizing the mixture. Moles XS HA = moles HA originally - n(moles base added) where n is an integer, 1 for a monobasic base, 2 for a dibasic base etc. Just write down the equation of your buffer, this will help you visualize what is actually going on.
 
 
 
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