The conjugate base of HNO3 is nitrate, or NO3-. HNO3 + H2O H3O+ + NO3- is the reaction that produces the conjugate base of HNO3.
The conjugate base of an acid is usually the acid molecule that remains after a hydrogen ion is lost. The nitrate is the conjugate base in this case. It is necessary to place an acid in water to produce a chemical reaction with the H2O molecules in order to conjugate it. HNO3 is an acid, and as a result of the chemical reaction, it releases a proton into the water. As a result, a nitrate conjugate base and a hydronium (H3O+) acid base are formed.
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