Zinc amalgam

Last updated March 23, 2025

Zinc amalgam is a solution of zinc in mercury. In practice the term refers to particles of zinc with a surface coating of the amalgam. A gray solid, it is typically used for reduction. It is written as Zn(Hg) in reactions.^[1] It is usually prepared by treating an aqueous suspension of zinc with mercuric chloride. Some zinc chloride is produced in the process.

Uses

Used from ~1837 to reduce 'local action' which degraded operation of Voltaic piles. See History of the battery#Invention.
To reduce ferric to ferrous ions in solution. See Jones reductor.
To reduce ketones and aldehydes to alkanes via the Clemmensen reduction in acidic conditions.

References

↑ Ham, Peter (2001). "Zinc Amalgam". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rz003. ISBN 0-471-93623-5.

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[1] Ham, Peter (2001). "Zinc Amalgam". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rz003. ISBN 0-471-93623-5.

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