Let me check I have this right then.
I first work out how much K2O I have in 100g of the solution that I start with, and also for the solution I want to end up with. The weight in grams is the number of mols * the molecular weight.
Then I adjust this to stake account of the fact that I am adding KOH and not K2O by using the formula:
K2O / K2Omr * 2 * KOHmr
7.8 / 94.2 * 2 * 56.1
Its as simple as that!
Great! Thanks very much.
I was wondering whether the fact that the alkali is evidently free alkali and comes out at the surface means that the reaction is not giving me a true geopolymer anyway. This would have to do with the ingredients I am using perhaps not being right. The first part of this video explains what I think might be going wrong:http://www.geopolymer.org/faq/alkali-activated-materials-geopolymers
The potassium is perhaps not locked into the resulting structure due to polymerisation not being complete.