Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: _cheers on November 07, 2009, 09:20:06 PM
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Given that the stepwise dissociation constants for phosphoric acid are:
Ka1 = 7.5×10-3; Ka2 = 6.2×10-8; Ka3 = 4.8×10-13
To prepare 1.35 L of a buffer solution having an ionic strength of 0.090 and a pH of 7.65 would require:
(mass) of Na2HPO4(anhydrous) and
(mass) of NaH2PO4(anhydrous).
I'm not too sure where to start on this one, but i'm using Ka = 6.2x10-8 in my calcs?
thanks