Chemistry

Problem

To prepare 1.00 L of a buffer that remains at the pKₐ of a monoprotic weak acid HA and can neutralize 0.050 mol of added HCl, a technician may purchase 2.0 M HA at \

0.040 per mL and 1.5 M NaA at

0.020 per mL. The total chemical cost must not exceed \$2.00. Which purchasing plan satisfies both the capacity requirement and the cost limit? a)

25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }25\,\text{mL of }1.5\,\text{M }\mathrm{NaA}

35\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }47\,\text{mL of }1.5\,\text{M }\mathrm{NaA}

25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }33\,\text{mL of }1.5\,\text{M }\mathrm{NaA}

25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }40\,\text{mL of }1.5\,\text{M }\mathrm{NaA}

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