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### Topic: Which has the lowest freezing point?  (Read 19633 times)

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#### Computerized

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##### Which has the lowest freezing point?
« on: August 23, 2009, 07:08:17 PM »
18. Which of the following solutions has the lowest freezing point?

(A) 0.20 m C6H12O6, glucose
(B) 0.20 m NH4Br
(C) 0.20 m ZnSO4
(D) 0.20 m KMnO4
(E) 0.20 m MgCl2

#### Borek

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##### Re: Which has the lowest freezing point?
« Reply #1 on: August 24, 2009, 02:48:34 AM »
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

#### Computerized

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##### Re: Which has the lowest freezing point?
« Reply #2 on: August 24, 2009, 09:28:36 PM »
Well, I thought it was E because it dissolves into 3 ions, whereas all the others dissolve into 2 or less. Am I correct?

#### MrTeo

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##### Re: Which has the lowest freezing point?
« Reply #3 on: August 25, 2009, 01:24:37 AM »
Right, in fact when you work with the same kind of solutions (same solvent, so same Kcr and same molality) the only thing that varies the final value is the number of ions got from dissociation ($request=http://www.forkosh.dreamhost.com/mimetex.cgi?{+\alpha+}&hash=46de7177512cb8002a15acfc27ce7c4a$)

$request=http://www.forkosh.dreamhost.com/mimetex.cgi?{+\Delta+t=K_{cr}+\cdot+m+\cdot+\left(+{1+++\alpha+}+\right)+}&hash=64a6eba9896d307ba0f68b78182dc62e$
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