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The Co²⁺/ Co(SCN)₄²⁻ Equilibrium

Last updated

Feb 22, 2023
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- The Chemistry of the Halogens
- The Collisions Cube Simulator

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Chemical Concept Demonstrated

The tendency for ionic substrates to extract into more polar solvents

Demonstration

75 mL of water is poured into a funnel.

A blue ether solution, made up of KSCN, CoCl₂, and ethyl ether, is added to the funnel.

The funnel is stoppered and the contents inside are shaken.

Observations

The water layer changes into a pink solution at the bottom of the separatory funnel.

Explanation

Water is more polar than ethyl ether. Some of the Co²⁺ ions are extracted into the water layer from the Co(SCN)₄ ^2-complex ions formed in the ether solution. The presence of Cl^- can be seen by adding silver nitrate (AgNO₃) solution until a white precipitate forms in the water layer at the bottom of the separatory funnel.

Chemical Concept Demonstrated

Demonstration

Observations

Explanation

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