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Question

The mass of oxalic acid crystals required to prepare 50mL of a 0.2N solution is:


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Solution

Step 1:Finding gram equivalent weight of Oxalic acid

  • Oxalic acid exists as the dihydrate H2C2O4.2H2O
  • Molecular weight of oxalic acid dihydrate = 126gmol-1

Gramequivalentweight=Molecularweightbasicity

Gramequivalentweight=1262

Gramequivalentweight=63gmol-1

Step 2: Finding mass of oxalic acid crystals required to prepare 50mL of a 0.2N

  • 1 Normal solution of oxalic acid should have 63g in 1L.
  • 0.2Normal solution of oxalic acid should have=60×0.2g=12.6g
  • 0.2Normal solution of oxalic acid should have 12.6g in 1L.
  • 0.2 Normal solution of oxalic acid should have in 50mL=0.05L is calculated below.
  • = 12.6×0.05=0.63g in 50 mL.

Hence the mass of oxalic acid crystals required to prepare 50mL of a 0.2N solution is 0.63g


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