Potassium Ferricyanide, with the CAS number 13746 - 66 - 2, is a bright red crystalline salt. It has the chemical formula K₃[Fe(CN)₆].
Physical Properties:
Potassium Ferricyanide has a wide range of applications in various industries:
When using Potassium Ferricyanide, the following steps should be followed:
Case 1: Photography Toning
A professional photographer wanted to create sepia - toned prints of black - and - white photographs. He prepared a solution of Potassium Ferricyanide and sodium thiosulfate. First, he diluted the Potassium Ferricyanide in water according to the formula. Then, he soaked the developed black - and - white prints in the solution. After a few minutes, the prints gradually changed color from black - and - white to a warm sepia tone. The final prints had a unique and artistic look, which was highly appreciated by his clients.
Case 2: Metal Ion Detection
In a chemical laboratory, a student was tasked with detecting the presence of iron(II) ions in a water sample. He added a few drops of a Potassium Ferricyanide solution to the water sample. Immediately, a deep - blue precipitate formed, indicating the presence of iron(II) ions. This simple and effective test helped the student to quickly identify the metal ions in the sample and complete his analysis.
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