Calculation of the Solubility of Salts in the Quinary System of NaCl-KCl-MgCl2-CaCl2-H2O Saturated with NaCl (Part I)
1972 Volume 26 Issue 1 Pages 16-20
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1972 Volume 26 Issue 1 Pages 16-20
The following approximation equations were prepared from the data on the solubility of sodiumchloride in the three ternary systems of NaCl-KCl-H2O, NaCl-MgCl2-H2O, and NaCl-CaCl2-H2O to estimate the solubilities in weight percentage of salts in the quinary system of NaCl-KCl-MgCl2-CaCl2-H2O saturated with NaCl at 25°C: Nacl=26.43-104.0 (n-3.45n3.33)(I) KCL=195.7nx/x+2.06y+1.76z (II) Mgcl2195.7ny/x+2.06y+1.76z (II) Cacl2 =195.7nz/x+2.06y+1.76z (IV) where n is the sum of the numbers of moles of K2Cl2 with the correction term of 0.762, moles ofMgCl2 and CaCl2 in 100 grams of solution, i.e.n=Σ (0.762K2Cl2+MgCl2+CaCl2) moles/100 g soln., and x, y, z are the weight fractions of KCl, MgCl2 and CaCl2. To verify these equations by experiments, three series of solutions containing the salts with theratios by weight of KCI, MgCl2 and CaCl2 of about 3:1:1, 1:3:1 and 1:1:3 were made, andsaturated with NaCl at 25±0.02°C and then analyzed.The solubilities were found to agree with that calculated by the equations (I)-(IV) within the errors at ±0.15 wt% for NaCl and ±0.03wt % for the other salts. Thus the validity of the equations were varified.
