NOC Oklahoma College Division of Mathematics & Engineering General Chemistry I L

Question

NOC Oklahoma College Division of Mathematics & Engineering General Chemistry I Laboratories Lab 7: Reaction Prediction Lab Pre-lab Questions 1. When blue (II) nitrate is reacted with sodium sulfide solution (Nasso a black precipitate is formed. A. What would the formula of the precipitate be? No 3 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 Page 1 of 9

Explanation / Answer

Formula of the precipitate is

CuS (Copper sulfide)

molecular equation:

Cu(NO3)2(aq) + Na2S(aq) ---> CuS(s) + 2NaNO3(aq)

full ionic:

Cu2+(aq) + 2NO3-(aq) + 2Na+(aq) + S2-(aq) ---> CuS(s) + 2Na+(aq) + 2NO3-(aq)

net ionic:

Cu2+(aq) + S2-(aq) ---> CuS(s)

Sodium ion and nitrate ion were the spectator ions removed.

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