Vitamin c calculation

I have a tablet about 500 mg of vitamin C contains :250mg of ascorbic acid and 285 mg of ascorbate sodium equivalent to 250mg of ascorbic acid.
The molecular weight of ascorbic acid is 176g and ascorbate sodium is 198g , i found the equivalent about 253 mg and not 250mg can someone explain me ?

Please also consider the following aspects while calculating Sodium ascorbate content equivalent to 250 mg of Ascorbic acid, (you may have to consider extra amount),

  • % Purity of Sodium ascorbate
  • Moisture content in Sodium ascorbate
  • Also you may have to add extra amount as “Overages” to compensate for loss on storage up to expiry date of the formulation (stability aspects).

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