<Tr> <Td> Odor </Td> <Td> odorless </Td> </Tr> <Tr> <Td> Density </Td> <Td> 3.386 g / cm (anhydrous) 2.51 g / cm (dihydrate) </Td> </Tr> <Tr> <Td> Melting point </Td> <Td> 498 ° C (928 ° F; 771 K) (anhydrous) 100 ° C (dehydration of dihydrate) </Td> </Tr> <Tr> <Td> Boiling point </Td> <Td> 993 ° C (1,819 ° F; 1,266 K) (anhydrous, decomposes) </Td> </Tr>

Copper (ii) oxide reacts with hydrochloric acid to produce copper (ii) chloride and water