Response to The Trouble With Xtol

I think you're right Wolfram. The molecular weights are 174 for Acorbic acid and 84 for Sodium Bicarbonate, and this is close enough to 2:1, assuming that the anhydrous form of both chemicals is used. This ratio gives 1.138 gms of Sodium ascorbate for each gramme of Ascorbic acid used.
The 10% solution formula on MrJones site is out by a gramme. It should be 87.9 gms Ascorbic acid and 42.4 gms Sodium bicarbonate in a litre of water. Not a massive error, and probably not worth worrying about.

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