Base
Sodium Carbonate is a base.
Sodium bicarbonate is a base.
Sodium bicarbonate is a base.
Sodium hydroxide is a base.
Sodium selenite is a salt formed by the combination of sodium hydroxide (a base) and selenous acid (an acid). Overall, it is considered to be a neutral compound.
Sodium oxalate is a salt formed from the neutralization reaction between oxalic acid (a weak organic acid) and sodium hydroxide (a strong base). Therefore, sodium oxalate is neither an acid nor a base; it is a salt.
Sodium bicarbonate is a weak base.
The neutralization of citric acid and sodium hydroxide is an acid-base reaction. Citric acid, being an acid, reacts with sodium hydroxide, a base, to form water and a salt (sodium citrate), resulting in a neutral pH solution.
base
Sodium sulfate is neither a base nor an acid. It is a salt composed of sodium ions and sulfate ions. It is neutral in nature.
Na-Ac is not an acid or a base by itself. It is the sodium salt of acetic acid, also known as sodium acetate. Sodium acetate is considered a basic salt because it is the conjugate base of a weak acid (acetic acid).
Sodium chloride is formed from a neutralization reaction between an acid and a base. The acid is hydrochloric acid and the other reagent would be a sodium base or a basic salt of sodium.