Question

when dissolved in water, an acid or a base breaks down into
o a proton and an electron.
o two negative ions.
o a positive and a negative ion.
o a positive ion and a proton.

Explanation:

Acids and bases dissociate in water into ions. Acids release hydrogen - ions (positive) and anions (negative), bases release hydroxide - ions (negative) and cations (positive). So they break down into a positive and a negative ion.

Answer:

a positive and a negative ion.