@codewiz The screenshots are talking of sodium peroxide. It makes a difference which chemical you start with. How much sodium peroxide to make 12% H2O2 is not the same as how much sodium percarbonate to make 12% H2O2. Also there are different assumptions of weight/weight vs. weight/volume percentages. Try being clear in the LLM prompt on whether you're aiming for weight percent (wt%), weight/volume (w/v). It's normally weight percent (wt%).