Chemistry

Problem

Two

1.0\,\text{L}

buffer solutions at the same temperature contain the weak acid

\text{HB}

and its conjugate base

\text{B}^-

. Data for each buffer are given below. Buffer X:

[\text{HB}]=0.20\,\text{M},\;[\text{B}^-]=0.20\,\text{M}

Buffer Y:

[\text{HB}]=0.05\,\text{M},\;[\text{B}^-]=0.50\,\text{M}

Which statement correctly compares their abilities to resist a pH decrease upon addition of a strong acid? a) Buffer X has the greater capacity because its components are equimolar. b) Buffer X has the greater capacity because its higher concentration of

\text{HB}

better absorbs added acid. c) Buffer Y has the greater capacity because it contains more

\text{B}^-

in total moles. d) Both buffers have identical capacities because their overall solute concentrations are similar.

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