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sodium sulfide and nickel(II) nitrate

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Adding colorless sodium sulfide to green nickel(II) nitrate produces a black precipitate.

Solution A: 0.1 M sodium sulfide (colorless)
Solution B: 0.2 M nickel(II) nitrate (green)
Precipitate: (black)
Ni(NO₃)₂(aq) + Na₂S(aq) --> NiS(s) + 2 NaNO₃(aq)

(2)

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sodium sulfide and copper(II) nitrate

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Adding colorless sodium sulfide to blue copper(II) nitrate produces a black precipitate.

Solution A: 0.1 M sodium sulfide (colorless)
Solution B: 0.2 M copper(II) nitrate (blue)
Precipitate: (black)
Cu(NO₃)₂(aq) + Na₂S(aq) --> CuS(s) + 2 NaNO₃(aq)

(2)

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sodium sulfide and cadmium(II) chloride

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Adding colorless sodium sulfide to colorless cadmium(II) chloride produces a yellow precipitate.

Solution A: 0.1 M sodium sulfide (colorless)
Solution B: 0.2 M cadmium(II) chloride (colorless)
Precipitate: (yellow)
CdCl₂(aq) + Na₂S(aq) --> CdS(s) + 2 NaCl(aq)

(2)

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sodium sulfide and lead(II) nitrate

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Adding colorless sodium sulfide to colorless lead(II) nitrate produces a dark brown precipitate.

Solution A: 0.1 M sodium sulfide (colorless)
Solution B: 0.2 M lead(II) nitrate (colorless)
Precipitate: (dark brown)
Pb(NO₃)₂(aq) + Na₂S(aq) --> PbS(s) + 2 NaNO₃(aq)

(2)

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