Potassium Ferrocyanide Concepts

The video tutorial explains how to write the formula for potassium ferrocyanide, a complex polyatomic ion. It details the components, including potassium and the ferrocyanide ion, which has a three-minus charge. The tutorial covers balancing the charges with potassium ions and compares ferrocyanide with ferricyanide, which has a different charge. The structure of potassium ferrocyanide is described, highlighting the central iron atom surrounded by cyanide ions. The video concludes with advice on using tables of polyatomic ions in general chemistry.

What is the symbol for potassium in the formula of potassium ferrocyanide?

• Pt

• K

• Po

• P

What is the chemical formula for the ferrocyanide ion?

• FeC6N

• FeCN6

• FeC4N

• FeCN4

How many potassium ions are needed to balance the charge of the ferrocyanide ion?

• Four

• One

• Three

• Two

What is the charge of the ferrocyanide ion?

• 4-

• 3-

• 2-

• 1-

How does the charge of the ferrocyanide ion compare to the Pharaoh side ion?

• Both are 3-

• Ferrocyanide is 4- and Pharaoh side is 3-

• Ferrocyanide is 3- and Pharaoh side is 4-

• Both are 4-

What is the central atom in the structure of potassium ferrocyanide?

• Carbon

• Iron

• Potassium

• Nitrogen

How many cyanide ions surround the central iron atom in potassium ferrocyanide?

• Five

• Six

• Seven

• Four

In a chemistry class, how might students be expected to know the formula for ferrocyanide?

• Memorize it

• Guess based on periodic trends

• Look it up in a textbook

• Use a table of polyatomic ions