Answer to Question #65123 in General Chemistry for Harleen Brar

Question

Ca and Mg are often determined in blood plasma by atomic emission. In this case, 1 mL of a blood sample was diluted with 25 mL of methanol. The analysis of the diluted sample gave a signal of 15 units for Ca and 20 units for Mg, respectively. Blood plasma standards spiked with Ca and Mg were used as standards and gave the following results:

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Standard Concentration (PPM) 0.50 1.0 5.0 10
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Ca 8.1 18.7 92 184
Mg 10.6 23.4 120 228
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What are the Ca and Mg concentrations in the original plasma sample?