InterviewSolution
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InterviewSolution
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a. Describe how you would prepare 500 mL of a1.0 M solution of potassium chloride that is93.0% pure. The gram formula weight ofpotassium chloride is 74.56 g/mol. |
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Answer» Calculate the mass of impure potassium chloride needed. mass of impure potassium chloride = M pure × V pure × gram formula weight / percent purity = 1.0 M × 0.500 L × 74.56 g/mol0.930 = 40 gSlowly add 40 g of 93% potassium chloride to a 500-mL volumetric flask half-filled with distilled or deionized water and swirl the flask to mix. When all the solid is dissolved and the solution is at room temperature, dilute to the mark and invert the flask several times to mix. |
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