Question:

The volume of 0.02M0.02\, M acidified permanganate solution required for complete reaction of 60mL60\, mL of 0.01MI0.01\, MI^{-} ion solution to form I2I_2 in mLmL is

Updated On: May 19, 2024
  • 60
  • 20
  • 40
  • 6
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The Correct Option is D

Solution and Explanation

Reaction of KMnO4KMnO _{4} with II ^{-} converting I2I _{2} is

2KMnO4+10I5I2+2Mn+22 KMnO _{4}+10 I ^{-} \longrightarrow 5 I _{2}+2 Mn ^{+2}
nn -factor of KMnO4=5KMnO _{4}=5 (in acidic medium)

II ^{-} convert into I2I _{2} then, nn -factor =2=2

Number of equivalent of KMnO4KMnO _{4}

= Number of equivalent of II^{-}
0.02×V×5=60×0.01×20.02 \times V \times 5 =60 \times 0.01 \times 2
V=6mLV=6 \,mL
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Concepts Used:

Stoichiometry

Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of the other reactants can also be calculated.

Stoichiometry helps us determine how much substance is needed or is present. Things that can be measured are;

  1. Reactants and Products mass
  2. Molecular weight
  3. Chemical equations
  4. Formulas

​​Stoichiometric Coefficient

The Stoichiometric coefficient of any given component is the number of molecules and/or formula units that participate in the reaction as written.

Mole Ratios

The mass of one mole of a substance in grams is called molar mass. The molar mass of one mole of a substance is numerically equal to the atomic/molecular formula mass.