Which statement is true about sodium hydroxide (naoh)? a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is a base because it increases the concentration of hydrogen ions. d. it is a base because it increases the concentration of hydroxide ions.

D. It is a base because it increases the concentration of hydroxide ions.

Explanation:  A base is a substance which  dissociates to give hydroxide ions in water.

An acid  is a substance which  dissociates to give hydrogen ions in water.

So is a base as it gives ions when dissolved in water.

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