In HNO3 (nitric acid), you get nitrate salts. When an acid reacts with a base, it forms a salt and water. Nitric acid is a strong acid, and it reacts with metal hydroxides, carbonates, and oxides to form metal nitrates. For example:

* Sodium hydroxide (NaOH) and nitric acid (HNO3) react to form sodium nitrate (NaNO3) and water (H2O):

NaOH + HNO3 → NaNO3 + H2O

* Calcium carbonate (CaCO3) and nitric acid (HNO3) react to form calcium nitrate (Ca(NO3)2) and water (H2O):

CaCO3 + 2HNO3 → Ca(NO3)2 + H2O + CO2

* Copper oxide (CuO) and nitric acid (HNO3) react to form copper nitrate (Cu(NO3)2) and water (H2O):

CuO + 2HNO3 → Cu(NO3)2 + H2O

Nitrate salts are typically soluble in water and can be used in various applications, such as fertilizers, explosives, and food preservatives.