封闭体系中碳酸盐的平衡

1、封闭体系中碳酸盐的平衡求算封闭体系：5=常数=3xl0-3mol/L时，CaCO3的溶解度?解：在封闭体系，ct=常数，本题以ct =3 ¥0-3mol/L为例。 查表可知碳酸钙的溶度积：Ksp=Ca2+CO32-=10-8.32V在碳酸钙溶液中存在如下平衡：CaCO3 ?Ca2+ + CO32-Ksp = Ca2+CO 32- = 10-8.23 (1)2+Ksp, ,Ca = co32- = KsP/( cTa2) (2) . lgCa2+ = IgK sp - IgCT - 1g 2 (3)1gCO32- = IgKsp- 1gCa2+= IgCT + 1g 2(4)又 02与

2、H*浓度的关系为：C2 = (1 + KL +写)1 (5)将(5)代入(3)、(4)得到lgCa2+和lgCO32-关于H+的关系式。 在Excel中求不同pH下的lgCa2+和lgCO32-列表如表1:表1 :不同pH下碳酸钙溶液中各种离子的浓度PHCTKspKiK2H+lga2lgCa2+lgCO32+4.00.0034.7863E-094.4668E-074.6774E-111.0000E-04-8.68192.8848-11.20484.20.0034.7863E-094.4668E-074.6774E-116.3096E-05-8.28312.4859-10.80594.40.00

3、34.7863E-094.4668E-074.6774E-113.9811E-05-7.88482.0877-10.40774.60.0034.7863E-094.4668E-074.6774E-112.5119E-05-7.48771.6905-10.01054.80.0034.7863E-094.4668E-074.6774E-111.5849E-05-7.09211.2949-9.61495.00.0034.7863E-094.4668E-074.6774E-111.0000E-05-6.69900.9019-9.22195.20.0034.7863E-094.4668E-074.677

4、4E-116.3096E-06-6.30970.5126-8.83265.40.0034.7863E-094.4668E-074.6774E-113.9811E-06-5.92620.1291-8.44915.60.0034.7863E-094.4668E-074.6774E-112.5119E-06-5.5511-0.2460-8.07405.80.0034.7863E-094.4668E-074.6774E-111.5849E-06-5.1878-0.6093-7.71076.00.0034.7863E-094.4668E-074.6774E-111.0000E-06-4.8404-0.9

5、567-7.36336.20.0034.7863E-094.4668E-074.6774E-116.3096E-07-4.5125-1.2846-7.03546.40.0034.7863E-094.4668E-074.6774E-113.9811E-07-4.2068-1.5903-6.72976.60.0034.7863E-094.4668E-074.6774E-112.5119E-07-3.9238-1.8733-6.4467pHCTKspKiK2H+lga2lgCa2+igCO32+6.80.0034.7863E-094.4668E-074.6774E-111.5849E-07-3.66

6、20-2.1351-6.18497.00.0034.7863E-094.4668E-074.6774E-111.0000E-07-3.4179-2.3792-5.94087.20.0034.7863E-094.4668E-074.6774E-116.3096E-08-3.1877-2.6095-5.71057.40.0034.7863E-094.4668E-074.6774E-113.9811E-08-2.9675-2.8296-5.49047.60.0034.7863E-094.4668E-074.6774E-112.5119E-08-2.7545-3.0426-5.27747.80.003

7、4.7863E-094.4668E-074.6774E-111.5849E-08-2.5464-3.2507-5.06938.00.0034.7863E-094.4668E-074.6774E-111.0000E-08-2.3416-3.4555-4.86458.20.0034.7863E-094.4668E-074.6774E-116.3096E-09-2.1393-3.6579-4.66218.40.0034.7863E-094.4668E-074.6774E-113.9811E-09-1.9389-3.8582-4.46188.60.0034.7863E-094.4668E-074.67

8、74E-112.5119E-09-1.7404-4.0567-4.26338.80.0034.7863E-094.4668E-074.6774E-111.5849E-09-1.5441-4.2530-4.06709.00.0034.7863E-094.4668E-074.6774E-111.0000E-09-1.3508-4.4463-3.87379.20.0034.7863E-094.4668E-074.6774E-116.3096E-10-1.1616-4.6355-3.68459.40.0034.7863E-094.4668E-074.6774E-113.9811E-10-0.9786-

9、4.8185-3.50159.60.0034.7863E-094.4668E-074.6774E-112.5119E-10-0.8044-4.9928-3.32729.80.0034.7863E-094.4668E-074.6774E-111.5849E-10-0.6424-5.1547-3.165310.00.0034.7863E-094.4668E-074.6774E-111.0000E-10-0.4967-5.3004-3.019610.20.0034.7863E-094.4668E-074.6774E-116.3096E-11-0.3709-5.4262-2.893810.40.003

10、4.7863E-094.4668E-074.6774E-113.9811E-11-0.2675-5.5297-2.790310.60.0034.7863E-094.4668E-074.6774E-112.5119E-11-0.1867-5.6104-2.709610.80.0034.7863E-094.4668E-074.6774E-111.5849E-11-0.1267-5.6704-2.649611.00.0034.7863E-094.4668E-074.6774E-111.0000E-11-0.0841-5.7130-2.607011.20.0034.7863E-094.4668E-07

11、4.6774E-116.3096E-12-0.0550-5.7422-2.577811.40.0034.7863E-094.4668E-074.6774E-113.9811E-12-0.0355-5.7616-2.558411.60.0034.7863E-094.4668E-074.6774E-112.5119E-12-0.0227-5.7744-2.545611.80.0034.7863E-094.4668E-074.6774E-111.5849E-12-0.0145-5.7826-2.537412.00.0034.7863E-094.4668E-074.6774E-111.0000E-12

12、-0.0092-5.7879-2.532112.20.0034.7863E-094.4668E-074.6774E-116.3096E-13-0.0058-5.7913-2.528712.40.0034.7863E-094.4668E-074.6774E-113.9811E-13-0.0037-5.7934-2.526612.60.0034.7863E-094.4668E-074.6774E-112.5119E-13-0.0023-5.7948-2.525212.80.0034.7863E-094.4668E-074.6774E-111.5849E-13-0.0015-5.7957-2.524313.00.0034.7863E-094.4668E-074.6774E-111.0000E-13-0.0009-5.7962-2.523813.20.0034.7863E-094.4668E-074.6774E-116.3096E-14-0.0006-5.7965-2.523513.40.0034.7863E-094.4668E-074.6774E-113.9811E-14-0.0004-5.7968-2.523213.60.0034.7863E-094.4668E-074.6774E-112.5119E-14-0.0002-5.7969-