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April 20, 2014

Homework Help: chemistry

Posted by alleyx3 on Sunday, October 28, 2012 at 7:32pm.

using the following salts listed below, calculate the moles of acid and conjugate base needed to make 100 ml of 0.50 M, ph 6.5,6.7, and 6.8 phosphate buffer solution. (For H2PO4-, pka=6.64)

Salt Molar mass, g/mol
KH2PO4 136.09
NaH2PO4*H2O 137.99
Na2HPO4*7H2O 268.09
K2HPO4 174.2

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