To prepare 500. mL of 0.5 M NaCl from a stock of 2.0 M NaCl one needs to ________.

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Quizplus · Accepted Answer

To prepare a diluted solution, the formula $C_1V_1 = C_2V_2$ is used, where $C_1$ and $V_1$ are the concentration and volume of the initial solution, and $C_2$ and $V_2$ are the concentration and volume of the final solution. Substituting the given values: $2.0 \, \text{M} \times V_1 = 0.5 \, \text{M} \times 500 \, \text{mL}$, solving for $V_1$ gives $V_1 = 125 \, \text{mL}$. This volume of the stock solution is then diluted with water to reach a total volume of 500 mL.

To Prepare 500