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In a common medical laboratory determination of the concentration of free chloride ion in blood serum, aserum sample is titrated with a $\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}$ solution.$2 \mathrm{Cl}^{-}(a q)+\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}(a q) \longrightarrow 2 \mathrm{NO}_{3}^{-}(a q)+\mathrm{HgCl}_{2}(s)$What is the Cl' concentration in a 0.25 -mL sample of normal serum that requires 1.46 $\mathrm{mL}$ of $8.25 \times 10^{-4} \mathrm{M}$ $\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}(a q)$ to reach the end point?
$9.6 \times 10^{-3} \mathrm{M}$
Chemistry 101
Chapter 4
Stoichiometry of Chemical Reactions
Chemical reactions and Stoichiometry
University of Central Florida
Brown University
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this question says that in a common medical laboratory determination of the concentration of free chloride ion in blood serum, the serum samples tie traded with H G and a 32 solution. And it gives us the balanced equation for that mutualization reaction. And the question asks, What is the C L minus? Concentration in a 320.25 ml sample of Neural Sierra that requires 1.46 emails of an 8.25 times 10 to the negative fourth Moeller h d n a 32 solution to reach the end point. All right, so it tells us the volume and concentration of the neutralizing re agents. Let's start there, and I'm gonna convert milliliters two leaders, because that's what ah, unit polarity is that so? 1.4 Sex mills is 0.14 six leaders of H G and in 32 and multiply that by the concentration and gives us, which is eight went to five times 10 negative four moles of each. She and oh, three two And that's polarities, That's it. One leader of H G and a 32 And then finally we had to convert from moles of H G and a 3 to 2 Moles of Cory Nayan. And so, from this bounce equation to give us, it takes one mole of H G in 32 to neutralize two bowls of glory and get of coin I on So one more each g 32 to neutralize two moles of court ion Great. Can you have leaders reached Vienna three to canceling out leaders. One was a tree in a three to cancel out moles left with 2.4. Here are nine times tend the negative sex moles. The seal minus. The last step is to figure out the concentration off that seo minus solution or what it was in the serum. So we divide that birth moles point for 09 times 10 negative six morals We'll see all minus over. It tells us it was a 0.25 mil sample again converting to leaders his 0.0 25 leaders. If you saw that, you would see that the concentration of CEO minus is 9.6 times 10 the negative third Moeller, see how my ass
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