Question

Write the formula of a reagent which will form a

precipitatewith a solution of AgNO3, but not with a solution
ofCu(NO3)2. and then write the formula of the precipitatewhich
forms.
Also write the formula of a reagent which will form
aprecipitate with a solution of CuCl2, but not with a solution
ofMgCl2. and, write the formula of the precipitate
whichforms.

Answer 1

HCl and H2S

HCl + AgNO3 ---> (HNO3) + AgCl.

Agcl is white in color and is formed by the reaction between colorless aqueous silver nitrateto a colorless solution solution of sodium chloride to produce an opaque white precipitate

H2S + CuCl2 ----- > CuS + HCl

CuS It is a moderate conductor of electricity. A black colloidal precipitate of CuS is formed when hydrogen sulfide, H2S, is bubbled through solutions of Cu(II) salts

Step-by-step explanation:

Answer 2

A) Adding
`H_2SO_4`

B) Adding
`HI`

Step-by-step explanation:

A) Adding
`H_2SO_4`

1)
`H_2SO_4 + 2 AgNO_3 \longrightarrow Ag_2SO_4 +2 HNO_3`

2)
`H_2SO_4 + Cu(NO_3)_2 \longrightarrow CuSO_4 +2 HNO_3`

`CuSO_4` is very soluble in water and, in the other hand,
`Ag_2SO_4` is not.

B) Adding
`HI`

1)
`2 HI + MgCl_2 \longrightarrow MgI_2 + 2 HCl`

2)
`2 HI + CuCl_2 \longrightarrow CuI_2 + 2 HCl`

`MgI_2` is very soluble in water and, in the other hand,
`CuI_2` is not.