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    Home » Normality and Molarity

    Normality and Molarity

    Dr. Vikas JasrotiaBy Dr. Vikas JasrotiaSeptember 22, 2022No Comments
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    Normality and Molarity

    NORMALITY: Normality is one way to express the concentration of the solution
    It is the number of gram equivalents of a solute present in one litre of solution.
    w = Mass of solute in gram
    V = Volume of solution in ml
    E = Equivalent weight of solute

    The equivalent weight of Solute: It is the number of parts by weight of the substance that combines or displaces, directly or indirectly, 1.008 parts by mass of hydrogen or 8 parts by mass of oxygen, or 35.5 parts by mass of chlorine. It can be calculated as
    (i) Equivalent mass for elements = Atomic mass / Valency
    (ii) Equivalent mass for acids = Molecular mass / Basicity of acids
    (iii) Equivalent mass for bases = Molecular mass / Acidity of base
    (iv) Equivalent mass for salts = Formula mass / (Valency of cation) (No. of cations)
    (v) Equivalent mass for oxidising agents = Formula Mass / No. of electrons gained per molecule
    vii) Equivalent weight of radicals = Formula mass of radical / No. of units of charge

    On dilution of the solution, the number of equivalents of the solute is conserved, and thus, we can apply the formula: N1V1 = N2V2

    Relation between Normality and Molarity:

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