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July 4, 2015

Homework Help: Chemistry

Posted by Anonymous on Wednesday, October 20, 2010 at 3:57pm.

You need to prepare 1.000 L (in a volumetric flask) of 0.50 M phosphate buffer, pH 6.77. Use the Henderson Hasselbalch equation with a value of 6.64 for pK2 to calculate the quantities of K2HPO4 and KH2PO4 you need to add to the flask.

What concentrations of [K2HPO4] and [KH2PO4] will you need to make the total concentration 0.50 M?
i figured out the ratio to be 1.35 and I keep getting .213M & .287M as my answers but those aren't correct.

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