Solubilization reactions:
Co(NO3)2(aq) → Co2+(aq) + 2 NO3–(aq)
Acid/base reactions:
H2S(aq) + H2O(l) → ← H3O+(aq) + HS–(aq) HS–(aq) + H2O(l) → ← H3O+(aq) + S2–(aq)
H2S(aq) + H2O(l) → ← H3O+(aq) + HS–(aq)
HS–(aq) + H2O(l) → ← H3O+(aq) + S2–(aq)
Precipitation reaction:
Co2+(aq) + S2–(aq) → CoS(s)
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