A 1.50 M NaCl stock solution is used to prepare two successive dilutions

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Problem

A 1.50 M NaCl stock solution is used to prepare two successive dilutions. First, 20.0 mL of the stock is transferred to a 250 mL volumetric flask and diluted to the mark to make solution A. Next, 10.0 mL of solution A is transferred to a 100 mL volumetric flask and diluted to the mark, producing solution B. What is the molarity of NaCl in solution B? (a) 0.024 M0.024\,\text{M} (b) 0.120 M0.120\,\text{M} (c) 0.012 M0.012\,\text{M} (d) 0.060 M0.060\,\text{M}

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