2023-03-29 The solubility of chlorophenols decreases with increasing chlorine substitution and decreasing pH. Pentachlorophenol (PCP) is readily soluble at pH 8 (20°C), with a solubility of 8 g/L, 2 g/L at pH 7, but only 0.14 g/L at pH 5 (Hobbs et al. 1993).Monochlorophenols (mono-CPs) are used as antiseptics