Question

KMnO₄ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H₂SO₄. Number of water molecules produced for 2 molecules of KMnO₄ is______.

Answer 1

Correct Answer: 68

The balanced reaction between KMnO\(_4\) and ferrous ammonium sulfate in the presence of H\(_2\)SO\(_4\) is:
\[ 2 \, \text{KMnO}_4 + 10 \, \text{Fe}^{2+} + 8 \, \text{H}_2\text{SO}_4 \rightarrow 2 \, \text{Mn}^{2+} + 10 \, \text{Fe}^{3+} + 8 \, \text{H}_2\text{O} + \text{K}_2\text{SO}_4 + 2\text{H}_2\text{SO}_4. \] This equation shows that for every 2 molecules of KMnO\(_4\), 8 molecules of water are produced. Thus, for 2 molecules of KMnO\(_4\), the total number of water molecules produced is: \[ 8 \, \text{water molecules}. \]