What substance is present in a solution consisting solely of electrolytes?

Electrolytes are substances which are capable of producing a solution that has the ability to conduct electricity. These electrolytes are formed from the dissociation of salts into ions. The positive ions are named cations while the negative ions are termed anions. 

Hence, the answer to these item is SALT. Salt are substances produced by the reaction of cations and anions. 

Because you don't want 2 different things mixing together unless their supposed to be mixed together

Explanation: