Editing Copper(II) chloride (section)

===Redox and decomposition===
Copper(II) chloride is a mild [[oxidizing agent|oxidant]]. It starts to decompose to [[copper(I) chloride]] and [[Chlorine|chlorine gas]] around {{convert|400|C}} and is completely decomposed near {{convert|1000|C}}:<ref name="Ullmann">{{Cite book|title=Ullmann's Encyclopedia of Industrial Chemistry|author1=Zhang, J. |author2=Richardson, H. W.|year=2016|isbn=978-3-527-30673-2|chapter=Copper Compounds|pages=1–31 |doi=10.1002/14356007.a07_567.pub2}}</ref><ref name="tgdta">{{cite journal |author1=Shuiliang Zhou |author2=Shaobo Shen |author3=Dalong Zhao |author4=Zhitao Zhang |author5=Shiyu Yan |title=Evaporation and decomposition of eutectics of cupric chloride and sodium chloride |journal=Journal of Thermal Analysis and Calorimetry |date=2017 |volume=129 |issue=3 |pages=1445–1452 |doi=10.1007/s10973-017-6360-y |s2cid=99924382 |language=en}}</ref><ref name="Kirk">{{Cite book|title=Kirk-Othmer Encyclopedia of Chemical Technology|last=Richardson|first=H. W.|year=2003|isbn=0471238961|chapter=Copper Compounds|doi=10.1002/0471238961.0315161618090308.a01.pub2}}</ref><ref name="cucl">{{cite journal |author1=Z. Wang |author2=G. Marin |author3=G. F. Naterer |author4=K. S. Gabriel |title=Thermodynamics and kinetics of the thermal decomposition of cupric chloride in its hydrolysis reaction |journal=Journal of Thermal Analysis and Calorimetry |date=2015 |volume=119 |issue=2 |pages=815–823 |doi=10.1007/s10973-014-3929-6 |s2cid=93668361 |url=https://research.library.mun.ca/13446/1/2015-JTAC.pdf |language=en}}</ref>
:{{chem2|2 CuCl2 → 2 CuCl + Cl2}}
The reported [[melting point]] of copper(II) chloride of {{convert|498|C}} is a melt of a mixture of copper(I) chloride and copper(II) chloride. The true melting point of {{convert|630|C}} can be extrapolated by using the melting points of the mixtures of CuCl and {{chem2|CuCl2}}.<ref>{{cite journal |author1=Wilhelm Biltz |author2=Werner Fischer |title=Beiträge zur systematischen Verwandtschaftslehre. XLIII. Über das System Cupro-/Cuprichlorid |journal=Zeitschrift für anorganische und allgemeine Chemie |date=1927 |volume=166 |issue=1 |pages=290–298 |doi=10.1002/zaac.19271660126 |language=de}}</ref><ref name="group">{{cite book |author1=A. G. Massey |author2=N. R. Thompson |author3=B. F. G. Johnson |title=The Chemistry of Copper, Silver and Gold |date=1973 |publisher=Elsevier Science |isbn=9780080188607 |language=en |page=42}}</ref> Copper(II) chloride reacts with several metals to produce copper metal or copper(I) chloride (CuCl) with oxidation of the other metal. To convert copper(II) chloride to copper(I) chloride, it can be convenient to reduce an aqueous solution with [[sulfur dioxide]] as the [[reducing agent|reductant]]:<ref name="Ullmann" />
:{{chem2|2 CuCl2 + SO2 + 2 H2O → 2 CuCl + 2 HCl + H2SO4}}