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MCAT Question A Day - 4/8/14

A student wishes to prepare a buffer whose pH is 6.3, using an acid HA with a pKa of 6.0. Which expression below will correctly express the ratio R of HA to NaA that must be mixed in order to achieve the desired pH?

A.  6.3 = 6.0 + log R
B.  6.0 = 6.3 + log R
C.  10-6.3 = 10-6.0 + log R