Complex sentence: Most perchlorates are colorless solids that are soluble in water, except for potassium perchlorate, which has the lowest solubility of any alkali metal perchlorate (1.5 g in 100 ml of water at 25 ° C).
Split into simpler sentences: Most perchlorates are colorless solids that are soluble in water. Potassium perchlorate has the lowest solubility of any alkali metal perchlorate (1.5 g in 100 ml of water at 25 ° C).