Chapter 4, Problem 81E

In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is titrated with a $\text{Hg}{\left({\text{NO}}_3\right)}_2$ solution.

$2{\text{Cl}}^{-}\left(aq\right)+\text{Hg}{\left({\text{NO}}_3\right)}_2\left(aq\right)\to 2{\text{NO}}_3{}^{-}\left(aq\right)+{\text{HgCl}}_2\left(s\right)$

What is the CF concentration in a 0.25-mL sample of normal serum that requires 1.46 mL of $8.25\times {10}^{-4}$M $\text{Hg}{\left({\text{HO}}_3\right)}_2\left(aq\right)$ to reach the end point?