Question

How many moles of H^+ are consumed for each mole of Mn^2+ ions in the reaction of Mn^2+ with BiO_3^- to produce MnO_4^- and Bi^3+ in acidic solution? Please enter an integer or half-integer.

Answer 1

(Mn²⁺ + 4 H₂O --> MnO₄- + 8 H⁺ + 5e- )             x 2
(BiO₃- + 6 H⁺ + 2e- --> Bi³⁺ + 3 H₂O )                x 5

Complete balanced chemical reaction equation is:

2Mn²⁺ + 5BiO₃- + 14H⁺ -> 2MnO₄- + 5Bi³⁺ + 7H₂O

from balanced equation the coefficient of H⁺ is 14, hence the number of moles of H+ are consumed is 14, but in question they are asked How many moles of H⁺ are consumed for each mole of Mn²⁺

Answer: 7