AP Chemistry Question! Redox Reaction

Test Preparation AP Test Preparation
1

<ol>
<li>Sodium chromate (Na2CrO4) can be prepared by oxidizing Cr3+ with sodium peroxide
(Na2O2) in basic solution. Write the half reactions and balance the reaction. </li>
</ol>

<p>Can anyone help me with this?</p>

2

<p>Sodium peroxide undergoes hydrolysis in aqueous solution yielding hydrogen peroxide:
2Na+ + [O2]2- + 2H2O → 2Na+ +2OH- + H2O2
Chromium (III) ions are oxidized by hydrogen peroxide in presence of hydroxide ions:
2Cr3+ + 3H2O2 + 10OH- → 2[CrO4]2- + 8H2O</p>