Question

When a blue copper (II) nitrate solution, Cu(NO_{3})_{2} is mixed with a colorless sodium sulfide solution (Na_{2}S), a black precipitate is formed. What is the identity of the black precipitate

Answer 1

The black precipitate formed when blue copper (II) nitrate solution reacts with colorless sodium sulfide solution is copper (II) sulfide (CuS).

Step-by-step explanation:

When a blue copper (II) nitrate solution, Cu(NO3)2 is mixed with a colorless sodium sulfide solution (Na2S), a chemical reaction occurs resulting in the formation of a black precipitate. The black precipitate formed in this reaction is copper (II) sulfide (CuS).

The reaction can be represented by the equation Cu(NO3)2(aq) + Na2S(aq) → CuS(s) + 2NaNO3(aq). This is an example of a double displacement reaction, commonly known in chemistry as a precipitation reaction because it results in the formation of an insoluble solid.