Question

If aqueous solutions of ammonium sulfide and copper(II) nitrate are mixed, which insoluble precipitate is formed?

Answer 1

This is a double replacement reaction, so the two new compounds formed are Ammonium Nitrate and Copper Sulfide. If you look up solubility guidlines for this problem it would be incredibly useful :)

I located sulfur on the guidlines, and it was under "insoluble". Copper was not one of the exceptions. Therefore, Copper Sulfide is insoluble.

Nitrate was under soluble, and had no exceptions, so Ammonium Nitrate is a soluble compound :)

Hope I could help!

Answer 2

Answer:
`CuS`

Step-by-step explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

Precipitation is a double displacement reaction in which one of the product is formed in solid state called as precipitate.

The balanced chemical reaction for ammonium sulphide and copper (II) nitrate is:

`(NH_4)_2S(aq)+Cu(NO_3)_2(aq)\rightarrow 2NH_4NO_3(aq)+CuS(s)`

Thus
`CuS` is formed as a precipitate.