Which of the given solutions should display the GREATEST departure from the freezing point, and the boiling point of the water solvent?

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Which of the given solutions should display the GREATEST departure from the freezing point, and the boiling point of the water solvent?

$A .$ $A.$ $L i C l (a q)$ $LiCl(aq)$
$B .$ $B.$ $N a C l (a q)$ $NaCl(aq)$
$C .$ $C.$ $sucrose (a q)$ $"sucrose"(aq)$
$D .$ $D.$ $N a_{3} P O_{4} (a q)$ $Na_3PO_4(aq)$
$E .$ $E.$ $M g B r_{2} (a q)$ $MgBr_2(aq)$

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Answer 1 · 2017-01-30T20:21:39

Probably $D$ $D$ if EQUAL, formal concentrations of each salt were prepared.

Explanation:

The more particles in solution, the greater the $freezing point depression$ $"freezing point depression"$ , and the greater the $boiling point elevation$ $"boiling point elevation"$

All these solutes speciate in aqueous solution to give a number of different particles:

$A .$ $A.$ $L i C l (s) \to L i^{+} + C l^{-}$ $LiCl(s)rarr Li^+ + Cl^-$

$B .$ $B.$ $N a C l (s) \to N a^{+} + C l^{-}$ $NaCl(s)rarr Na^+ + Cl^-$

$C .$ $C.$ $sucrose (s) \to sucrose (a q)$ $"sucrose"(s)rarr "sucrose"(aq)$

$D .$ $D.$ $N a_{3} P O_{4} (s) + H_{2} O \to 3 N a^{+} + H P O_{4}^{-} + H O^{-}$ $Na_3PO_4(s) + H_2O rarr 3Na^(+) + HPO_4^(-) + HO^-$

$E .$ $E.$ $M g B r_{2} (s) \to M g^{2 +} + 2 B r^{-}$ $MgBr_2(s)rarr Mg^(2+) + 2Br^-$

Clearly the phosphate ion delivers the most species, the most ions, in aqueous solution. And thus this species should give the greatest $boiling point elevation$ $"boiling point elevation"$ .

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Which of the given solutions should display the GREATEST departure from the freezing point, and the boiling point of the water solvent?

$A .$ $A.$ $L i C l (a q)$ $LiCl(aq)$
$B .$ $B.$ $N a C l (a q)$ $NaCl(aq)$
$C .$ $C.$ $sucrose (a q)$ $"sucrose"(aq)$
$D .$ $D.$ $N a_{3} P O_{4} (a q)$ $Na_3PO_4(aq)$
$E .$ $E.$ $M g B r_{2} (a q)$ $MgBr_2(aq)$

1 Answer

Explanation:

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Which of the given solutions should display the GREATEST departure from the freezing point, and the boiling point of the water solvent?

A.A. LiCl(aq)LiCl(aq) B.B. NaCl(aq)NaCl(aq) C.C. sucrose(aq)"sucrose"(aq) D.D. Na3PO4(aq)Na_3PO_4(aq) E.E. MgBr2(aq)MgBr_2(aq)

1 Answer

Explanation:

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$A .$ $A.$ $L i C l (a q)$ $LiCl(aq)$
$B .$ $B.$ $N a C l (a q)$ $NaCl(aq)$
$C .$ $C.$ $sucrose (a q)$ $"sucrose"(aq)$
$D .$ $D.$ $N a_{3} P O_{4} (a q)$ $Na_3PO_4(aq)$
$E .$ $E.$ $M g B r_{2} (a q)$ $MgBr_2(aq)$