[Histonet] Potassium Ferrocyanide Question

[Greg Dobbin]

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

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


Statement of Confidentiality
This message (including attachments) may contain confidential or privileged information intended for a specific individual or organization.  If you have received this communication in error, please notify the sender immediately.  If you are not the intended recipient, you are not authorized to use, disclose, distribute, copy, print or rely on this email, and should promptly delete this email from your entire computer system.  

D?claration de confidentialit?
Le pr?sent message (y compris les annexes) peut contenir des renseignements confidentiels ayant pour objet une personne ou un organisme particulier. Si vous avez re?u la pr?sente communication par erreur, veuillez en informer l'exp?diteur imm?diatement. Si vous n'?tes pas le destinataire pr?vu, vous n'avez pas le droit d'utiliser, divulguer, distribuer, copier ou imprimer ce courriel ou encore de vous en servir, et vous devriez l'effacer compl?tement de votre syst?me informatique.