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Questions asked by users might not always be phrased in the clearest way.
This looks like a set of chemical formulas. Let's break it down:
Na+ represents a sodium ion, which has lost one electron and has a positive charge.
CaO is calcium oxide, an ionic compound made from calcium (Ca2+) and oxygen (O2-).
HCl is hydrochloric acid, a strong acid formed by hydrogen (H+) and chlorine (Cl-).
To understand what happens when these react, you'd need to know the specific conditions and whether they're reacting together or individually with something else.