The study included five locations in Kurdistan Region, Iraq, represented by the soils of Zawita, Zakho, Dukan, Smaquli and Aqrah, in order to know the solubility and precipitation of carbonate minerals based on the values of omega (Ω) and saturation index (SI) using water of different ionic strength (chloride water, sulfur water, Tigris river water).the results showed that the dolomite mineral was more precipitated in term of omega (9.38 * 108) and the saturation index (8.97) in the case of chloride water, while magnesite was soluble where the value of omega was)0.01) and saturation index (-1.85), then when using sulfur water the same behavior appeared for the same mineral (dolomite) in term of precipitation (SI = 9.08) and magnesite in term of solubility (SI = -0.94). The same applies to the water of the Tigris River. As a general conclusion, the dolomite was more precipitated and the magnesite was more soluble in the presence of chloride water compared with the water of the Tigris River and the sulfur water.