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Question

What is equivalent weight of crystalline oxalic acid?


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Solution

Equivalent weight:

  • It is expressed as the ratio of atomic weight or molecular weight of a given species to its n-factor.
  • It depends on the type of substance if it is an acid, molecule, ion or a base.

Formula used:

  • Equivalent weight of acid=Molecular weight of acidBasicity of acid

Or,

  • Equivalent weight of base=Molecular weight of baseAcidity of base

Step 1: Given,

  • Chemical formula of crystalline oxalic acid is HOOC-COOH.2H2O.
  • Molecular weight of crystalline oxalic acid =126gmol-1

Step 2: Determine the equivalent weight of crystalline oxalic acid.

  • The oxalic acid can donate two hydrogens. So, the basicity of acid is 2.
  • Equivalent weight of acid=Molecular weight of acidBasicity of acid
  • Equivalent weight of oxalic acid=126gmol-12
  • Equivalent weight of oxalic acid=63geq-1mol-1

Therefore, the equivalent weight of crystalline oxalic acid is 63geq-1mol-1.


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