Copper Sulfate (slow motion)
Copper Sulfate (slow motion) - Periodic Table of Videos
Introduction
The video showcases the reaction of copper sulfate with ammonia, captured in high-speed slow motion. This experiment, often introduced to students early in their chemistry education, reveals fascinating changes in color and state.
Main Points
- Initial Reaction:
- Copper sulfate in solution appears as a pale blue due to copper ions (Cu²⁺) surrounded by water molecules.
- The solution is poured slowly to observe the reaction in detail.
- Reaction with Ammonia:
- Adding ammonia (an alkaline solution) precipitates a pale blue solid, a mixture of copper hydroxide and copper sulfate.
- With more ammonia, the precipitate dissolves, forming a deep blue solution due to copper ions with four ammonia molecules in a tetrahedral shape.
- Color Changes:
- The transition from pale blue to intense blue is visually striking and demonstrates the formation of coordination complexes.
- Surprisingly, the dark blue color appears before the visible precipitate, likely due to the time required for crystal formation.
- Visual Appeal:
- The experiment's end result resembles the planet Earth as seen from space, highlighting the beauty of chemical reactions.
Conclusion
The slow-motion video of copper sulfate reacting with ammonia provides an educational and visually stunning demonstration of chemical reactions and coordination complexes. It serves as a valuable teaching tool for understanding the properties and behaviors of copper compounds.