RE: {SPAM?} [Histonet] Potassium Ferrocyanide Question

From:"Douglas D Deltour"

Formula weight is commonly abbreviated FW. The formula weight of a substance
is the sum of the atomic weights of each atom in the chemical formula. 
When the chemical formula equals the molecular formula, then the formula
weight is also called the molecular weight. The abbreviation commonly used
for molecular weight is MW.

Douglas D. Deltour HT(ASCP)
Histology Manager
Professional Pathology Services, PC
One Science Court
Suite 200
Columbia, SC 29203
Office (803)252-1913
Fax (803)254-3262 
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-----Original Message-----
[] On Behalf Of Greg Dobbin
Sent: Tuesday, September 25, 2007 11:33 AM
Subject: {SPAM?} [Histonet] Potassium Ferrocyanide Question

Hi Folks,
Chemistry is not my forte for sure, so a little help from the chemistry
gurus would be greatly appreciated.

I purchased potassium ferrocyanide trihydrate for use in our Perl's
stain. The bottle that is almost empty lists the contents as
K4Fe(CN)6-3H2O with a molecular wt of 422.39.

The new bottle (different supplier) uses the same name for the chemical
("potassium ferrocyanide trihydrate") but the formula is listed as
FeK4N6-3H2O and the F.W. is 356.7.

Can someone remind me what the "F" in F.W. stands for? And did I buy
the right chemical? Both are ACS grade chemicals.

Thank you.

Greg Dobbin, R.T.
Chief Technologist, Histology Lab
Dept. of Laboratory Medicine,
Queen Elizabeth Hospital,
P.O. Box 6600
Charlottetown, PE    C1A 8T5
Phone: (902) 894-2337
Fax: (902) 894-2385

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