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 by the combination of positive ions (cations) from a base and negative ions (anions) from an acid through a neutralization reaction. Vinegar is an acid, soap is a salt of fatty - acids and a base but the general definition of being formed from a base cation and acid anion best fits a simple salt. Carbonate is a type of anion and not the general term for what is formed by base cations and acid anions.

Answer:

A. salt