Final answer:
To complete and balance the redox equation HI + HNO3 → 12 + NO in an acidic solution, assign coefficients to each species and balance the equation. The sum of the coefficients is 24.
Step-by-step explanation:
To complete and balance the redox equation HI + HNO3 → 12 + NO in an acidic solution, it is important to identify the oxidation numbers of each element. In this case, hydrogen (H) has an oxidation number of +1, iodine (I) has an oxidation number of -1, nitrogen (N) has an oxidation number of +5, and oxygen (O) has an oxidation number of -2.
By assigning coefficients to each species, we can balance the equation. The balanced equation is:
8HI + 3HNO3 → 4I2 + 3NO + 6H2O.
The sum of the coefficients is 8 + 3 + 4 + 3 + 6 = 24.
Learn more about Redox equations