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Molarity of citrate phosphate buffer - (Nov/02/2010 )

Hi Guys,What molarity is my pH6.5 citrate phosphate solution if i add 0.4 M sodium phosphate and 0.2M citric acid?
thanks in advance!


0.4 M sodium (or 2x to 3x higher, depending on which sodium phosphate is used. Since the pH is determined by this, you can back calculate the amount of sodium, knowing the pH. Is this homework?)
0.4 M phosphate
0.2 M citrate