The nucleation of Ca(OH) 2 was studied by mixing two homogeneous solutions using a titration setup in the presence of the additives. A CaCl 2 solution (0.5 mol L -1 ) and a NaOH solution (1 mol L -1 ) are introduced into a stirring vessel containing 150 mL of ultra-pure water at a delivery rate of 0.4 mL min -1 .