Equivalent Concept Revision Notes - IIT JEE/NEET Preparation | Nucleon

Equivalent Concept

• Concept of equivalents
• Equivalent mass of element
Number of parts by mass of an element which reacts or displaces from a compound 1.008 parts by mass
of hydrogen, 8 parts by mass of oxygen and 35.5 parts by mass of chlorine, is known as the equivalent
weight of that element.

• Equivalent weight (E)
• 1 Equivalent mass is a pure number which, when expressed in gram, is called gram equivalent mass.
2 The equivalent mass of substance may have different values under different conditions.

• Valency factor calculation
• 1 For Elements :
Valency factor = valency of the element

• Normality
• Normality of a solution is defined as the number of equivalents of solute present in one litre (1000 mL) solution.
Let V mL of a solution is prepared by dissolving W g of solute of equivalent weight E in water.

• Law of Equivalence
• The law states that one equivalent of an element combine with one equivalent of the
other. In a chemical reaction, equivalents and milli equivalents of reactants react in equal
amount to give same number of equivalents or milli equivalents of products separately.

• Titrations
• Titration is a procedure for determining the concentration of a solution by allowing a carefully measured volume
to react with a standard solution of another substance, whose concentration is known.

• Permanganate Titrations
• 1 KMnO4 is generally used as oxidising agent in acidic medium, generally provided by dilute H2SO4 .

• Iodometric/Iodimetric Titrations
• Compound containing iodine are widely used in titrations

• Calculation of Available Chlorine from a sample of Bleaching Powder
• The weight of available Cl2 released from the given sample of bleaching powder on reaction with dilute
acids or CO2 is called available chlorine.

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