Re: Help to make solution calculation
- From: "erschroedinger@xxxxxxxxx" <erschroedinger@xxxxxxxxx>
- Date: Wed, 26 Aug 2009 07:38:35 -0700 (PDT)
On Aug 25, 6:10 pm, Zhida <zh...@xxxxxxxxx> wrote:
I am making solution that is not very diluted. For example, 1L 4M NaCl
water solution. I used to run approximate calculation to ignore
solute volume. i.e. 1 Liter water plust 4x MW=4x58.443=233.77g of
NaCl.
Since molarity is defined as moles of solute per liter of solution,
the solute volume is not relevant and neither is the solvent volume.
However, now I need more accurate method to calculate solvent and
solute. I came accross a web site that claims it gives more accurate
results (with ideal solution model ??). The solvent water calculated
is now ~892ml with same amount of NaCl (~233 grame). This is much
different from the value I got before. I am not sure how much it is
reliable.
Why not make it up the way most people do? Put the amt of solute in a
flask, add water to dissolve it, then add water until it's at the
volume needed (vol of the flask)?
Can any of you give comment about that? The web site is athttp://www.popproperty.net/PopularTools/SolutionMaker.aspx?Dilute=0
Thank you in advance!
.
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