Question

the redox reaction given below occurs in basic solution.
zn + bro₃⁻ → zn⁺² + br⁻
balance the half - reaction:
zn → zn⁺²
how many electrons are transferred?
?e⁻

Explanation:

Step1: Determine oxidation state of Zn

In elemental form, Zn has an oxidation state of 0. In \(Zn^{2+}\), the oxidation state of Zn is +2.

Step2: Calculate electron transfer

The change in oxidation state for Zn is from 0 to +2. To find the number of electrons transferred, we calculate the difference in oxidation states. Since Zn goes from 0 to +2, it loses 2 electrons (because oxidation is loss of electrons, and an increase in oxidation state means loss of electrons). The half - reaction for the oxidation of Zn is \(Zn
ightarrow Zn^{2 +}+2e^-\), which shows that 2 electrons are transferred.

Answer:

2