Here's what happens:
* ZnO is a basic oxide.
* Ni(NO₃)₂ is a soluble ionic compound.
The reaction results in the formation of:
* Zn(NO₃)₂ (zinc nitrate) - a soluble ionic compound
* NiO (nickel(II) oxide) - an insoluble solid precipitate
The balanced chemical equation is:
ZnO (s) + Ni(NO₃)₂ (aq) → Zn(NO₃)₂ (aq) + NiO (s)
In summary:
* The zinc from ZnO replaces the nickel in Ni(NO₃)₂ to form Zn(NO₃)₂.
* The nickel from Ni(NO₃)₂ combines with oxygen from ZnO to form NiO, which precipitates out of solution.
