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Consider the following acids and bases:
HCO2H, Ka=1.8x10-4
HONH2, Kb=1.1x10-8
HOBr, Ka=2.0x10-9
(C2H5)2NH, Kb=1.3x10-3
Which combination of the following substances would make the best choice to make a pH=6.0 buffer solution?
HOBr
KCO2H
NaOBr
HONH2
(C2H5)2NH
HONH3NO3
(C2H5)2NH2Cl
HCO2H
A best buffer has approximately equal concentrations of weak acid and conjugate base (or weak base and conjugate acid). When [weak acid] = [conjugate base], then pH = pKa of the acid component of the buffer. Therefore, look for a weak acid/conjugate base pair or weak base/conjugate acid pair whose pKa value for the acid component in the buffer is close to the pH you want to make the buffer at.
If you were going to build a system to check the effectiveness of automobile catalytic converters on cars, what substances would you want to look for in the car exhaust?
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