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The table below lists results of data collected for known solutions of Pb2", Cu and N when test solutions of HCl, NaOH and NH3 are added. Use results from the Table to answer questions below Test solution added Known solution Observations A white precipitate formed. The precipitate dissolved upon addition of more HCI solution HCI NaOH A white precipitate formed NHs No change was evident in the white precipitate. HCI No reaction NaOH A blue precipitate formed NH The precipitate dissolved, producing a deep blue solution. HC No reaction Pb(NO3)2 solution Cu(NO:)2 Cu(NO3)2 solution Ni(NO3)2 NaOH A white precipitate formed NH3 The precipitate dissolved, producing a violet solution. Ni(NO3)2 solution Write balanced molecular, complete ionic and net ionic equations for the mixture of Ni(NO3)2 and NaOH. Use appropriate subscripts to denote the state 1.

Answer 1

Ni(NO₃)₂ (aq) + 2NaOH (aq)   $\rightarrow$ Ni(OH)₂ (s)  + 2NaNO3 (aq)  is the molecular balanced chemical equation.

Here the species that are present in solid form will mot get dissociated to form ions.

Hence complete ionic equation is :

Ni²⁺(aq) + 2NO₃^-(aq) + 2Na⁺(aq) + 2OH^-(aq) $\rightarrow$ Ni(OH)₂ (s) + 2Na⁺ (aq) + 2NO_{​​​​3}^- (aq)

Hence net balanced ionic equation is :

Ni²⁺(aq) + 2OH^-(aq) $\rightarrow$ Ni(OH)₂(s)