In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is

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In a common medical laboratory determination of theconcentration of freechloride ion in blood serum, a serum sample is titrated with aHg(NO3)2 solution.2Cl−(aq) + Hg(NO3)2 (aq) ⟶ 2NO3−(aq) + HgCl2 (s) What is the Cl−concentration in a0.250-mL sample of normal serum that requires 3.50 mL of 5.446 ×10−4 MHg(NO3)2(aq) to reach the end point?