Ionic model
The above is an ionic model for the mixture of strong acid aqueous solution and strong base aqueous solution. Which of the following explanations is correct about this?
a) The mixed solution is perfectly neutral, i.e. its is 7.
b) ion and ion are spectator ions.
c) The number of ions in the acid solution was smaller than that of the base solution before mixing.
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1 solution
There are 3 B+ ions, 2 A- ions, 1 OH- ion left. Obviously there is a Hydroxide ion in the final mixture so a) is incorrect.
A- ions and B+ ions shouldn't have been contained in same solution before the reaction because it said 'the mixture of strong acid solution and strong base solution'. And they aren't H+ or OH-. Also, they have not participated in any reactions so they are spectator ions.
This solution is a mixture of acid solution and base solution, and we can find out that acid solution contained same numbers of H+ ions and A- ions, and base solutions contained same numbers of OH- ions, and B+ ions. There are 3 B+ ions and 2 A- ions which means the acid solution had 4 ions in total(2 H+, 2 A-), and base solution had 6 ions in total(3 OH-, 3 B+), so c) is correct.