Question

which is formed by positive ions from a base and negative ions from an acid?
o salt
o vinegar
o soap
o carbonate

Explanation:

Salts are formed in acid - base reactions. Positive ions (cations) come from the base and negative ions (anions) come from the acid. Vinegar is an acid, soap is formed from the reaction of fatty acids and bases in a different way, and carbonate is a type of anion that can be part of salts but is not the general term for what is formed by base cations and acid anions.

Answer:

A. salt