To prepare 1.00 L of a buffer that remains at the pKₐ of a monoprotic weak acid HA…

CHEMISTRY · Single correct · ISC · Chemistry · Equilibrium · Solutions

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 mL of 2.0 M HA and 25 mL of 1.5 M NaA25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }25\,\text{mL of }1.5\,\text{M }\mathrm{NaA} (b) 35 mL of 2.0 M HA and 47 mL of 1.5 M NaA35\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }47\,\text{mL of }1.5\,\text{M }\mathrm{NaA} (c) 25 mL of 2.0 M HA and 33 mL of 1.5 M NaA25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }33\,\text{mL of }1.5\,\text{M }\mathrm{NaA} (d) 25 mL of 2.0 M HA and 40 mL of 1.5 M NaA25\,\text{mL of }2.0\,\text{M }\mathrm{HA}\text{ and }40\,\text{mL of }1.5\,\text{M }\mathrm{NaA}

Related theory

Browse the problem library