0.01 M KMnO₄ solution was added to 20.0mL of 0.05 M Mohr’s salt through a burette. The initial reading of 50mL burette is zero. The volume of KMnO₄ solution left in the burette after the end point is__________ mL. (nearest integer)

 

<p>n-factor of KMnO₄ in acidic medium = 5</p><p>n-factor of Mohr's salt = 1</p><p>meq of KMnO₄ = meq of Mohr's salt</p><p>0.01 * 5 * V = 0.05 * 1 * 20</p><p>Volume of KMnO₄ used, V = 20 mL</p><p>So; Volume of KMnO₄ left in burette = 50 -20mL</p><p>= 30 mL</p>

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