Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Rb2S and Ni(NO3)3 are mixed

Question

a. Rb+(aq) + NO3-(aq) → RbNO3(s)

b. No reaction occurs

c. 2 Ni3+(aq) + 3 S2-(aq) → Ni₂S₃(s)

d. 2 Ni3+(aq) + 3 S2-(aq) + 6 Rb+(aq) + 6 NO3-(aq) → 2 Ni3+(aq) + 3 S2-(aq + 6 RbNO3(s)

e. 2 Ni3+(aq) + 3 S2-(aq) + 6 Rb+(aq) + 6 NO3-(aq) → Ni₂S₃(s) + 6 Rb+(aq) + 6 NO3-(aq)

Answer 1

It usually helps to write the molecular formula first

3Rb₂S(aq) + 2Ni(NO₃)₃(aq) => 6RbNO₃(aq) + Ni₂S₃(s)

Since a precipitate is formed, we can write the net ionic equation as

2Ni³⁺(aq) + 3S^2-(aq) => Ni₂S₃(s). Net ionic equation