Calcium is determined in serum by microtitration with EDTA. A 100 microliter sample is treated with two drops of 2 M KOH, Cal-Red indicator is added, and the titration is performed with 0.00122 M EDTA, using a microburet. If 0.203 mL EDTA is required for titration, what is the level of calcium in the serum in mg/dL?

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A: Step 1: Step 2: Step 3: Step 4:

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