RE: [Histonet] Potassium Ferrocyanide Question

From:"Tony Henwood"

FW means Formula weight. It is usually the same as the molecular weight.
According to the formulas you have recorded in your email, the second is
missing a few carbons ie:
K4Fe(CN)6-3H2O with a molecular wt of 422.39
FeK4N6-3H2O and the F.W. is 356.7.
Is this correct?


Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC)
Laboratory Manager & Senior Scientist
The Children's Hospital at Westmead,
Locked Bag 4001, Westmead, 2145, AUSTRALIA.
Tel: 612 9845 3306
Fax: 612 9845 3318

-----Original Message-----
[] On Behalf Of Greg
Sent: Wednesday, 26 September 2007 2:33 AM
Subject: [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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