the "i" in delta T = imk

[rpost3]

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OK, so the i value for Pb(NO3)2 would be 3 because it will dissociate into 3 ions. But for ethylene glycol (C2H602), the MCAT solutions manual for AAMC PS7 #55 says the "i" value is 1, not 10. I don't get this. Is the ethylene glycol not ionic enough or what?

 

[RPedigo]

OK, so the i value for Pb(NO3)2 would be 3 because it will dissociate into 3 ions. But for ethylene glycol (C2H602), the MCAT solutions manual for AAMC PS7 #55 says the "i" value is 1, not 10. I don't get this. Is the ethylene glycol not ionic enough or what?

Um, to take off the OH groups on the glycol would mean that there would be a positive charge on the carbon. That's no good. Ethylene glycol is far from ionic. How are you getting TEN? Do you think that the second you put it in water, it'll break apart into millions of pieces, like individual atoms? If that was true, I guess we wouldn't need to spend so much time breaking down sugars and proteins, becuase they'd fall apart instantly!

 

[rpost3]

Um, to take off the OH groups on the glycol would mean that there would be a positive charge on the carbon. That's no good. Ethylene glycol is far from ionic. How are you getting TEN? Do you think that the second you put it in water, it'll break apart into millions of pieces, like individual atoms? If that was true, I guess we wouldn't need to spend so much time breaking down sugars and proteins, becuase they'd fall apart instantly!

Wasn't sure if "i" was the # of atoms in the molecule or what. The question was if "i" only pertains to ionically bonded molecules, and you answered it. Thanks.

 

[RPedigo]

Wasn't sure if "i" was the # of atoms in the molecule or what. The question was if "i" only pertains to ionically bonded molecules, and you answered it. Thanks.

Yep! In solution, it's how many "things" it breaks up into.

Here's a couple random ones to see if you got the concept.

Nitric acid (HNO3)
Answer: Two

Calcium chloride (CaCl2)
Answer: Three

Glucose (C6H12O6)
Answer: One

 

[Brandon81081]

Yep! In solution, it's how many "things" it breaks up into.

Here's a couple random ones to see if you got the concept.

Nitric acid (HNO3)
Answer: Two

Calcium chloride (CaCl2)
Answer: Three

Glucose (C6H12O6)
Answer: One

Thanks...keep posting like this. it's helpful

 

[Foolins]

wouldnt Pb(NO3)2 break into 2 molecules? or is that 2 a subscript?