Re: [Histonet] Potassium Ferrocyanide Question

From:Rene J Buesa

"F.W." is the same as "Molecular Weight", and stands for "Formula Weight" so if the manufacturer recognizes a different "FW" or "MW", something is not "kosher".
  Also check because you wrote two different composition formulas for the 2 products, the correct being the one you wrote first.
  rené J.
Greg Dobbin  wrote:
  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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