What is the concentration of Cl- in solution after the reaction is complete
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What is the concentration of Cl- in solution after the reaction is complete

[From: ] [author: ] [Date: 12-03-17] [Hit: ]
200 M calcium chloride. What is the concentration of Cl- in solution after the reaction is complete?(450.0 mL) x (0.268 M AgNO3) = 120.(400.......
A 450.0 mL sample of a 0.268M solution of silver nitrate is mixed with 400.0 mL of 0.200 M calcium chloride. What is the concentration of Cl- in solution after the reaction is complete?

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2 AgNO3 + CaCl2 → 2 AgCl(s) + Ca(NO3)2

(450.0 mL) x (0.268 M AgNO3) = 120.6 mmol AgNO3
(400.0 mL) x (0.200 M CaCl2) = 80.0 mmol CaCl2

120.6 mmol AgNO3 would react completely with 120.6 x (1/2) = 60.3 mmol CaCl2 but there is more CaCl2 present than that, so CaCl2 is in excess.

(80.0 mmol CaCl2 initially) - (60.3 mmol CaCl2 reacted and precipitated) = 19.7 mmol CaCl2 remaining in solution

(19.7 mmol CaCl2) x (2 mol Cl{-} / 1 mol CaCl2) = 39.4 mmol Cl{-}

Supposing additive volumes:
(39.4 mmol) / (450.0 mL + 400.0 mL) = 0.0464 mol/L Cl{-}
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