\"a black precipitate is formed\" Nar Name orthe ivision of Mathematics & Engine

Question

   "a black precipitate is formed"

Nar Name orthe ivision of Mathematics & Engineering Northern Oklahoma College General Chemistry I Laboratories Lab 7: Reaction Prediction Lab Pre-lab Questions 1. When blue copper (D nitrate is reacted with sodium sulide slution(aS).a precipitate is formed. with sodium sulfide solution (NaS), a b A. What would the formula of the precipitate be? B. Write a molecular equation for the reaction. C. Write a complete ionic equation for the reaction. D. Write a NET ionic equation for the reaction. E. What are the spectator ions in this reaction?

Explanation / Answer

a) Formula of the black precipitate is CuS

b) molecular equation is Cu(NO3)2 + Na2S ---CuS +2NaNO3

c) ionic equation is Cu+2 + S-2

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