Cuprous Chloride(WSDTY) the metastable zone is determined by cooling an unsaturated solution until a crystal appears, and then the solution is gradually heated until the crystal re-dissolves. The temperatures of crystal disappearance and appearance are recorded and the difference between them is the metastable zone width. To measure MSZW, an HCL solution of known molarity is prepared in a jacket vessel by diluting an HCL solution (12 M) with the corresponding volume of water to make 200 ml of solution. The specified amount of CuCl2 is weighed and added to the jacket vessel. The solution is continuously stirred at 300 to 350 RPM with a magnetic stirrer. A programmable heater/chiller that circulate ethylene-glycol solution through the jacket vessel control the solution temperature, as well as the heating / cooling rates. The temperature of the solution is measured with a digital thermocouple.

The solution is heated to the initial temperature, Tinitial, and held until all CuCl2 is dissolved (homogenous mixture), and then the solution is cooled at a constant cooling rate, until the first crystal appears, Tmet. The solution is then heated at a constant heating rate, until the crystal disappears. The magnitude of cooling and heating rates may be different.

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