<Tr> <Td> IDLH (Immediate danger) </Td> <Td> TWA 100 mg / m (as Cu) </Td> </Tr> <Tr> <Th_colspan="2"> Related compounds </Th> </Tr> <Tr> <Td> Other anions </Td> <Td> Copper (II) sulfide </Td> </Tr> <Tr> <Td> Other cations </Td> <Td> Nickel (II) oxide Zinc oxide </Td> </Tr>

The base used is copper oxide. name and give the chemical formula of the acid used