Respuesta :
The net ionic equation is,Ca2+(aq.) + S2(aq.) - --> Ca S (s) . This involves a displacement reaction.
The displacement reaction occurs here. A displacement reaction occurs when a more reactive element displaces, or pushes out, a less reactive element from a compound that contains the less reactive element. After a displacement reaction, the less reactive element is now pure and left uncombined. This is the special type of reaction where the anions exchange cations, in the form,
A + BC ---> AC + B
Ca(NO3)2 + Na2S = Ca S + NaNO3
This will most often occur if Ca(NO3)2 is more reactive than Na2S thus giving a more stable product. The reaction in that case is exergonic and spontaneous.
so, ionic equation is,
Ca2+ + 2NO3- + 2Na+ + S2- ====> Ca S + 2NO3- + 2Na+
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