Question

Calculate the Equivalent mass of Sulphuric Acid?

Answer 1

Hint :The mass of one equivalent, that is, the mass of a given material that will mix with or displace a specified quantity of another material, is known as equivalent weight. The mass of an element that combines with or displaces 1.008 grams of hydrogen, 8.0 grams of oxygen, or 35.5 grams of chlorine is its equivalent weight. These figures are calculated by dividing the atomic weight by the typical valence; for oxygen, this is \[\dfrac{{16.0{\text{ }}}}{2}g{\text{ }} = {\text{ }}8.0{\text{ }}g\].

Complete Step By Step Answer:
The mass that provides or interacts with one mole of hydrogen cations ( $ {H^ + } $ ) is the equivalent weight of an acid or base. In a redox reaction, one mole of electrons ( $ {e^ - } $ ) is supplied or interacts with the equivalent weight of each reactant. Unlike atomic weight, which is dimensionless, equivalent weight contains dimensions and units of mass. Equivalent weights were previously obtained through experiment, but are now calculated from molar masses (to the extent that they are still utilised). The equivalent weight of a compound may also be computed by dividing the molecular mass by the amount of positive or negative electrical charges produced by the complex's dissolution.
Sulfuric acid has the chemical formula $ {H_2}S{O_4} $ .
Its molecular mass is 2 + 32 + 64 = 98 u
The formula for calculating an acid's equivalent weight is Molecular mass divided by the number of replacement hydrogen atoms equals equivalent weight.
Sulphuric acid has two hydrogen atoms that can be replaced. Fill in the blanks in the above expression.
Gram equivalent = $ \dfrac{{98}}{2} = 49g.e{q^{ - 1}} $ .

Note :
Even if they did not believe in atomic theory, many chemists considered comparable weights to be a valuable tool. Equivalent weights were a valuable generalisation of Joseph Proust's law of definite proportions (1794), which made chemistry a quantitative discipline. After embracing atomic theory earlier in his career, French scientist Jean-Baptiste Dumas (1800–84) became one of the most powerful opponents of the theory, but remained a firm defender of equal weights.