Difference between Normality and Molarity.
Brian Go
What is the difference between Normality and Molarity?
Brian Go | Love, it's so tough
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Brian Go | Chemistry 224 Lab:
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Vinny
>I feel really silly for asking this question....
>What is the difference between Normality and Molarity?
>Brian Go
Brian...
Molarity (M) is number of moles of a solute per liter of solution.
Normality (N) is "n" times the molarity of a redox reagent (where "n" =
number of electrons donated or accepted by that reagent). For acids and bases
it is also "n" times the molarity; however, in this case, "n" = number of
protons donated or accepted.
For a more thorough description, take a look at J.H. Kennedy's text
"Analytical Chemistry Principles". You will soon find that there is yet
another unit of concentration called "formality". :) Good question BTW!
Vince Hamner
vi...@vt.edu
Lloyd R. Parker
: Brian...
: Vince Hamner
: vi...@vt.edu
Normality is not accepted by SI, so most textbooks have
discontinued it. And good, for that really confused students. You
can always work a titration, redox or acid-base, using molarity and
stoichiometry.
Yes, I've heard of formal and formality. That was used for ionic
substances, since molarity implied (to some people) molecules.
Thus, 55.84 g of NaCl in 1 liter of solution was 1 F.
Brian Go
Lloyd R. Parker <lpa...@emoryu1.cc.emory.edu> wrote:
>Vinny (vi...@vt.edu) wrote:
>: In article <CsnGL...@watserv2.uwaterloo.ca> b...@sciborg.uwaterloo.ca (Brian Go) writes:
>
>: >I feel really silly for asking this question....
>: >What is the difference between Normality and Molarity?
>: >Brian Go
>
>: Brian...
>
>: Molarity (M) is number of moles of a solute per liter of solution.
>
>: Normality (N) is "n" times the molarity of a redox reagent (where "n" =
>: number of electrons donated or accepted by that reagent). For acids and bases
>: it is also "n" times the molarity; however, in this case, "n" = number of
>: protons donated or accepted.
>
>discontinued it. And good, for that really confused students. You
>can always work a titration, redox or acid-base, using molarity and
>stoichiometry.
>
>Yes, I've heard of formal and formality. That was used for ionic
>substances, since molarity implied (to some people) molecules.
>Thus, 55.84 g of NaCl in 1 liter of solution was 1 F.
>
Normality as the equivalence per liter of solution. And a lab manual
which assumes you know what it is already.... Can't win...
Thanks, the lab is now finished!
Brian
Lee Kim
: In article <2vma9m$4...@emoryu1.cc.emory.edu>,
: Brian
Yes, when I was in high school, I learned normality vs. molarity. But, in
college, the chem. courses [physical/analytical/organic/general/biochem.] don';t
go into what normality really is...they just skip it. But, in the Aldrich
catalogue, normality is printed for instance...for the various acids that
are marketed. Oops...not Aldrich...I mean...Fisher Scientific...and I'm
sure that other manufacturers do the same thing. I find it strange how
that's not in mode...to go over and explain what normality is even though
it's still being used today in standard references...
Lee