Question

Write the formula of a reagent which will form a

precipitatewith a solution of CuCl2, but not with a solution
ofMgCl2. and write the formula of the precipitate
whichforms.

Answer 1

Adding
`Na_2CO_3`

Step-by-step explanation:

Adding
`Na_2CO_3`

1)
`Na_2CO_3 + CuCl_2 \longrightarrow CuCO_3 + 2 NaCl`

2)
`Na_2CO_3 + MgCl_2 \longrightarrow MgCO_3 + 2 NaCl`

The salt
`CuCO_3` is insoluble in water but, in the other hand, the
`MgCO_3` has a very good solubility.