Study of the solubility of calcium hydroxide

Calcium hydroxide (hydrated lime) chemical, strong base. It is a white powder, poorly soluble in water. Slaked lime is obtained by reacting calcium oxide (quicklime) with water. This reaction is exoteric, comes with the release of 16 kcal 1/67 KJ per mole. Disinfecting action of slaked lime is the formation of hydroxyl ions in aqueous solutions, the greater the concentration of the latter, the stronger the disinfecting action of lime. In this case, the temperature dependence of the solubility of hydrated lime was studied. Temperature dependence was studied at temperatures of 200 °C; 500 °C; 700 °C and 1000 °C. The results of the study showed that with an increase in temperature in an undersaturated solution, the activity of OH- ions significantly decreases, which indicates a decrease in the solubility of hydrated lime in water. The solubility of slaked lime was studied when 1,0 was added to its solution; 3,0; 5,0 and 10,0 sodium chloride. As a result of the study, it was found that the addition of 3,0 % sodium chloride in a 20,0 % solution of slaked lime increases the ionic strength of the solution, which leads to an increase in solubility 2,2 times. All experiments were performed in 3 replicates.