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# Buffers and Conjugates

APCHEM-BI1AV0

Which conjugate acid or base of the following choices would make the best buffer solution?

A

${ HS{ O }_{ 4 } }^{ - }$

B

${ { C }_{ 2 }{ H }_{ 3 }{ O }_{ 2 } }^{ - }$

C

$HCl$

D

$C{ l{ O }_{ 4 } }^{ - }$