What is the net ionic equation for the single replacement reaction Ca(s)+ 2 HNO₃(aq)→ H₂(g)+ Ca(NO₃)₂(aq)Calcium is above hydrogen in the activity series.

Question

Quizplus · Accepted Answer

The net ionic equation only includes the species that undergo a chemical reaction. In this case, calcium replaces hydrogen in the nitrous acid solution to form calcium nitrite and hydrogen gas. The balanced equation is:
Ca(s) + 2 HNO2(aq) → Ca(NO2)2(aq) + H2(g)
The net ionic equation is:
Ca(s) + 2 H+(aq) → Ca2+(aq) + H2(g)
We can see that the nitrite ion (NO2-) does not participate in the reaction, so it is not included in the net ionic equation. Therefore, the correct answer is D, which only includes the relevant species.

What Is the Net Ionic Equation for the Single Replacement