https://en.m.wikipedia.org/wiki/Solubility

https://en.m.wikipedia.org/wiki/Supersaturation

https://en.m.wikipedia.org/wiki/Inverted_sugar_syrup

WS Calcium
Water Soluble WS

https://www.microfarmguide.com/water-soluble-calcium/

..

Ion charges and secondary (=meso) nutrients: Calcium, Magnesium and Sulphur

https://wikifarmer.com/ion-charges-and-secondary-meso-nutrients-calcium-magnesium-and-sulphur/

Potassium (K+), Calcium (Ca, Ca2+), and Magnesium (Mg, Mg2+) have positively charged ions (cations).

Magnesium's position in the periodic table (group 2) tells us that it is a metal. Metals form positive ions (cations).