yellow prussiate of potash
Definition
Noun: - A chemical compound, specifically potassium ferrocyanide trihydrate (K₄[Fe(CN)₆]·3H₂O), which is a yellow crystalline salt. It is produced by reacting potassium cyanide with ferrous (iron(II)) salts.
Usage Notes
This is a technical, historical, or common name used primarily in gardening, horticulture, and some industrial contexts. It refers to a specific, non-toxic cyanide compound (the cyanide is tightly bound, making it safe for handling). It is not a term used in everyday conversation.
Examples
- The gardener used yellow prussiate of potash as a fertilizer additive.
- Yellow prussiate of potash is commonly applied to prevent iron chlorosis in plants.
- A solution of yellow prussiate of potash can be used in certain photographic processes.
Advanced Usage
- The compound is more precisely known in chemistry as potassium hexacyanoferrate(II) trihydrate.
- Despite containing cyanide groups, yellow prussiate of potash is stable and of low toxicity because the cyanide ions are firmly bound to the iron atom, forming a ferrocyanide complex.
Variants and Related Words
- Potassium ferrocyanide: The modern chemical name.
- Prussiate of potash: A shorter, historical variant.
- Ferrocyanide: Refers to the [Fe(CN)₆]⁴⁻ anion present in the compound.
Synonyms
- Potassium hexacyanoferrate(II) (technical synonym)
- Potassium ferrocyanide trihydrate (full technical name)
Important Note
Yellow prussiate of potash is distinct from potassium cyanide (KCN), which is a highly toxic, simple cyanide salt. The "ferrocyanide" complex in yellow prussiate renders it much safer for controlled use.
Noun
-
a cyanide compound that is prepared by the reaction of potassium cyanide with ferrous salts; commonly used by gardeners
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