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### Topic: Nitrite titration  (Read 3143 times)

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#### Sophia7X

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##### Nitrite titration
« on: January 25, 2013, 04:39:19 PM »
http://www.norweco.com/html/lab/test_methods/4500no2bfp.htm

I am wondering how they got the equation to solve for N content?

I looked everywhere and could not find any derivation of it, could someone please show me how they got that?
Entropy happens.

#### Borek

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##### Re: Nitrite titration
« Reply #1 on: January 25, 2013, 05:04:08 PM »
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

#### Sophia7X

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##### Re: Nitrite titration
« Reply #2 on: January 25, 2013, 05:13:55 PM »
I tried. I understand the BC and DE part and subtracting them, but I can't understand where in the world does the 7 come from?
Entropy happens.

#### Borek

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##### Re: Nitrite titration
« Reply #3 on: January 25, 2013, 06:29:01 PM »
That's usually stoichiometric coefficient, that's why I suggested to write reaction equations.

Note: I have not checked if the equation is correct, doesn't have to be. But following stoichiometry is the only way to check.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

#### Sophia7X

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##### Re: Nitrite titration
« Reply #4 on: January 26, 2013, 03:56:59 PM »
Oh I see where the 7 came from (atomic mass of N and the fact that nitrite supplies 2 electrons in the half reaction).
Entropy happens.