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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: junoso on July 25, 2007, 06:33:23 PM

Title: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: junoso on July 25, 2007, 06:33:23 PM

I'm trying to figure out how many grams is equal to 1N(normal) of ceric ammonium nitrate. The molecular weight is 548.26grams. Please *delete me* I've been stuck on this question for 2 days!

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: sjb on July 26, 2007, 08:04:49 AM

With respect to what?

The issue with normalities is that you need a base reaction to say what you're (hypothetically) titrating against.

1 mole of CAN will formally dissociate to give 2 moles of ammonium ions, 1 mole of ceric ions and 6 moles of nitrate ions.

So if you're looking at wrt to anions, 1N would be 91.4g per litre, but if it's ammonium, 274g / l

S

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: AWK on July 26, 2007, 08:24:10 AM

It depends on the method of titration. In redox titration
Ce⁴⁺ => Ce₃₊
and an equivalent is equal to mole

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: junoso on July 26, 2007, 02:23:26 PM

Yes, this is a redox titration. I'm using this as a titrant and my sample contains ferric ammonium sulfate solution(10% in 15% H2SO4). I thought it would be 1N=1M correct?

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: AWK on July 27, 2007, 01:10:57 AM

Do you mean (NH4)2Fe(SO4)2 ? (ferrous)

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: junoso on July 30, 2007, 06:31:48 PM

No, ferric FeNH4(SO4)2 12H2O

Title: Re: How many grams is equal to 1N of Ceric Ammonium Nitrate?
Post by: AWK on July 31, 2007, 03:18:16 AM

Then, how can you perform titration
Fe(III) cannot be easily oxidzed .
Most redox titration use oxidation Fe(II) to Fe(III)