Hiya. Experimenting with adding zinc citrate into a mouthwash formulation. Google tells me that 2.6 grams of zinc citrate are soluble in one litre of water at 25ºC. But I'm ending up with a lot of undissolved solid even with a lot more water. Tried adding citric acid which helps but not sure if this is a desirable reaction for my purpose. Anyone have any ideas? fyi I'm very much a beginner here!!