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Question

Calculate the equivalent weight of H2SO4.


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Solution

  1. The equivalent mass which is also known as gram equivalent mass is the mass which will combine or displaces a fixed quantity of another substance.
  2. Equivalent mass = Molarmassn-factorofacid
  3. N-factor of acid is the number of H+ions released by an acid.
  4. In sulphuric acid, N-factor is 2.
  5. Mass of 2 hydrogen atoms: 1
  6. Mass of sulphur: 32
  7. Mass of oxygen atom: 1
  8. Molarmassofsulphuricacid(H2SO4)=Massof2hydrogenatoms+Massofsulphur+Massof4oxygenatom.
  9. = 2(1)+32+4(16)

= 98u

10. Equivalent mass = Molarmassn-factorofacid

= 982

= 49u

The equivalent mass of Sulphuric Acid is 49u or 49 g/mol.


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