14.5.4 CIA Demonstration: The Cobalt(II)-Catalyzed Reaction of Potassium Sodium Tartrate

Question 1

CIA Demonstration: The Cobalt(II)-Catalyzed Reaction of Potassium Sodium
Tartrate

Answer 1

• A catalyst is a substance which decreases the activation energy of a reaction, thereby increasing the reaction rate.
• Although a catalyst may change forms during the course of a reaction, at the end of the reaction the catalyst will be unchanged overall.

Question 2

note

Answer 2

• A catalyst is a substance which decreases the activation energy of a reaction, thereby increasing the reaction rate.
• The reaction between potassium sodium tartrate, hydrogen peroxide, and hydroxide ion is slow even at 70 ̊C. Adding a catalyst speeds up this reaction considerably.
• Cobalt(II) ion catalyzes the reaction between potassium sodium tartrate, hydrogen peroxide, and hydroxide ion.
• Cobalt(II) ion is red in aqueous solution.
• During the course of the reaction, the cobalt(II) ion forms a complex ion with tartrate ion. This complex ion has a dark greenish color.
• Although a catalyst may change forms during the course of a reaction, at the end of the reaction the catalyst will be unchanged overall.
• After the reaction has reach completion, the solution of cobalt(II) ion catalyst has returned to its original red color