Homework Help: chemistry

Posted by Jessie on Sunday, September 26, 2010 at 10:28am.

20) The ideal value of i (van't Hoff factor) for (NH4)3PO4.
A) 2 B) 5 C) 4 D) 3 E) 1

I know the answer but how are problems like this figured out?

chemistry - DrBob222, Sunday, September 26, 2010 at 1:27pm
You look at how they ionize.
(NH4)3PO4 ==> 3NH4^+ + PO4^-3
So that's 4 particles.
NaCl is 2.
CsCl = 2
BaCl2 = 3
Ba3(PO4)2 = 5
C12H22O11(sucrose; i.e., table sugar) = 1 since it dissolves BUT doesn't ionize.
Glucose, C6H12O6 = 1

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