Chemistry

Problem

Three lactic acid buffer solutions, each

1.0\,\text{L}

and at the same temperature, have the compositions shown. Buffer I:

[\text{HA}]=0.30\,\text{M},\;[\text{A}^-]=0.10\,\text{M}

Buffer II:

[\text{HA}]=0.20\,\text{M},\;[\text{A}^-]=0.20\,\text{M}

Buffer III:

[\text{HA}]=0.10\,\text{M},\;[\text{A}^-]=0.30\,\text{M}

When equal amounts of (a) strong acid and (b) strong base are separately added to each buffer, which of the following rankings is correct? (a) Capacity toward added strong acid (b) Capacity toward added strong base a) (a) I > II > III (b) III > II > I b) (a) II > I > III (b) II > III > I c) (a) III > II > I (b) I > II > III d) (a) III > II > I (b) III > II > I

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