Acid-base buffers are most effective when the target pH of the buffer solution i

Question

Acid-base buffers are most effective when the target pH of the buffer solution is close (within one unit) to the pka of the conjugate acid in in the conjugate acid/base pair to be used in the buffer. This is called the buffer range for a particular acid/base system. For the three questions below, select the two compounds from the which could be most effectively combined to create a buffer at the target pH. You will not need to use all of the compounds -and should need to use each compound only once pH - 4 buffer

Explanation / Answer

if we need buffer with pH w= 4

then

Ka = 10^-4 approx

then

the nearest will be acetic acid + acetat which has a pKa near 4.75

that is, the best option shown

choose

NaCH3COO

CH3COOH

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