Three phosphate buffers are listed below

CHEMISTRY · Subjective · CBSE · Chemistry · Equilibrium · Equilibrium

Problem

Three phosphate buffers are listed below, each at

1.0\,\text{L}

total volume. (a)

0.30\,\text{mol}\ \mathrm{H_2PO_4^-}

and

0.70\,\text{mol}\ \mathrm{HPO_4^{2-}}

(b)

0.50\,\text{mol}\ \mathrm{H_2PO_4^-}

and

0.50\,\text{mol}\ \mathrm{HPO_4^{2-}}

(c)

0.40\,\text{mol}\ \mathrm{HPO_4^{2-}}

and

0.60\,\text{mol}\ \mathrm{PO_4^{3-}}

A process will introduce

0.050\,\text{mol}

\mathrm{HCl}

into the solution. Identify which buffer will best resist the resulting pH decrease. Write the net ionic equation that shows how that buffer neutralizes the added

\mathrm{HCl}

Related theory

Equilibrium
Buffer Solutions

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