Only ~24.3 mLs of H2O is released from 300g of Potassium Metabisulphite from that reaction, it is inconsequential.
Even in solution, all these things will have densities far greater than 1.0 g/cm^3, not less, so it certainly wouldn't be 2 litres. All the formulae in the almanacs are given to be used as they are, they are based around starting with 1 litre of water, not making a final volume of 1 litre or x litres, all the formulae are given. Whatever it comes out to be is the final volume without adjustment of extra water, all the formulae in the almanac are given this way and are intended to be used that way. That is the convention in the almanac. What Ilford and Kodak did is a different convention. I wouldn't confuse the two.
To elaborate, their convention is to specify concentration by weight to volume in 1 litre of solvent (water), not 1 litre of final volume, which is less than 1 litre of water.
IE, it's 100g amidophenol, 300g of metabisulphite in 1 litre of water not 1 litre of volume. To which potash is added.
edit: Upon further reading, the volume of water created should be less, it appears the 300g of metabisulphite specified is intended to not be the anhydrous form.
Last edited by Athiril; 09-17-2011 at 07:02 AM. Click to view previous post history.