The reaction below was carried out in an acidic solution.

[+103 —>12

Which statement is true about this equation?

Although it is unbalanced, it can be balanced by using the half-reaction method.

It has been balanced by using the half-reaction method.

It has been balanced by directly using spectator ions.

Although it is unbalanced, it can be balanced by directly using spectator ions.

Although it is unbalanced, it can be balanced by using the half-reaction method  

Explanation:

Skeleton half-reaction:                         IO₃⁻ ⟶ I₂

Balance atoms other than O and H: 2IO₃⁻ ⟶ I₂

Balance O:                                           2IO₃⁻ ⟶ I₂ + 6H₂O

Balance H:                                           2IO₃⁻  + 12 H⁺ ⟶ I₂ + 6H₂O

Balance charge:                                 2IO₃⁻  + 12 H⁺ + 10e⁻ ⟶ I₂ + 6H₂O

A and C are wrong. The original equation is not balanced. It has 3 O on he left and none on the right.

D is wrong. You can't balance any equation by using spectator ions.

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.