is kcl water soluble
Solubility is defined as the amount of salt (grams) per volume (liter). Potassium chloride (KCl) is the most soluble potassium fertilizer up to a temperature of about 20Â°C (fig. 1); at higher temperatures potassium nitrate (KNO 3) is more soluble. Both salts have an endothermic reaction when dissolved (the solution cools as the fertilizer dissolves).