3D model (JSmol)
|Molar mass||134.45 g/mol (anhydrous)|
170.48 g/mol (dihydrate)
|Appearance||yellow-brown solid (anhydrous)|
blue-green solid (dihydrate)
|Density||3.386 g/cm3 (anhydrous) |
2.51 g/cm3 (dihydrate)
|Melting point|| 498 °C (928 °F; 771 K) (anhydrous) |
100 °C (dehydration of dihydrate)
|Boiling point||993 °C (1,819 °F; 1,266 K) (anhydrous, decomposes)|
|70.6 g/100 mL (0 °C) |
75.7 g/100 mL (25 °C)
107.9 g/100 mL (100 °C)
68 g/100 mL (15 °C)
|distorted CdI2 structure|
|EU classification||Not listed|
exposure limit (PEL)
|TWA 1 mg/m3 (as Cu)|
|Other anions||Copper(II) fluoride|
|Other cations||Copper(I) chloride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Copper(II) chloride is light brown when anhydrous. It is green when hydrated. It is a weak oxidizing agent. It reacts with aluminium foil to make hydrogen, copper(I) oxide, and aluminium chloride. This is used in school demonstrations. It releases chlorine and turns into copper(I) chloride when heated very hot. It reacts with sodium hydroxide to make copper(II) hydroxide. Copper(II) chloride reacts with metals to make metal chlorides and copper. It puts out blue flames if it is heated in a flame. It reacts with sulfur dioxide to make copper(I) chloride. It dissolves in water to make a blue solution. When more chloride is added, it turns green, then yellow.
It is made by reacting copper with chlorine. It can also be made by reacting copper(II) hydroxide, copper(II) oxide, or copper(II) carbonate with hydrochloric acid and from pure copper and from 1:1 solution of hydrogen peroxide and hydrochloric acid where copper first get oxidized to CuO from H2O2 and then reacts with HCl to form CuCl2, reaction goes like this:
Cu + H2O2 → CuO + H2O
CuO + 2HCl → CuCl2 + H2O
- "NIOSH Pocket Guide to Chemical Hazards #0150". National Institute for Occupational Safety and Health (NIOSH).
- "Amazing Rust.com - CuCl2". www.amazingrust.com.
- "Types of Reactions". www.wiredchemist.com.
- "USES and APPLICATIONS of CHEMICALS elements compounds mixtures formulations". www.docbrown.info.
- "Copper FAQ - Dartmouth Toxic Metals Superfund Research Program". www.dartmouth.edu.