This is an acid-base reaction (neutralization): Na2O is a base, HCl is an acid.
Reactants:
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Na2O – Sodium oxide
Other names: Disodium oxide, Sodium monoxide, Disodium monoxide
Appearance: White solid ; White lumps or powder
HCl – Chlorane, Hydrogen chloride
Other names: Hydrochloric acid, M, Uriatic acid
Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
Products:
NaCl – Sodium chloride
Other names: {{unbulleted list, Salt, Table salt
Appearance: Colorless cubic crystals
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxide
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas