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Table 3 Analytical data and solubility of the (Ca1-xMnx)CO3 solid solutions in N2-degassed water at 25 °C

From: Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C

Sample Dissolution time (h) pH Concentration (mmol/L) log_IAPc Average log_IAP ΔGf° (kJ/mol) Average ΔGf° (kJ/mol)
Ca Mn HCO3 + CO3
(Ca1.00Mn0.00)CO3 2400 8.15 0.6712 0.0000 1.2626 − 8.40 − 8.46 − 1129.41 − 1129.71
  4800 8.14 0.6405 0.0000 1.1771 − 8.46  ± 0.06 − 1129.73  ± 0.30
  7200 8.12 0.6146 0.0000 1.1512 − 8.51   − 1129.99  
(Ca0.89Mn0.11)CO3a 2400 8.14 0.7306 0.0029 1.3955 − 8.63 − 8.70 − 1094.74 − 1095.12
(Ca0.88Mn0.12)CO3b 4800 8.11 0.6762 0.0021 1.2796 − 8.74  ± 0.07 − 1095.36  ± 0.38
  7200 8.13 0.6635 0.0019 1.2983 − 8.72   − 1095.27  
(Ca0.78Mn0.22)CO3a 2400 8.07 0.9646 0.0041 1.9198 − 8.74 − 8.83 − 1059.45 − 1059.96
(Ca0.76Mn0.24)CO3b 4800 8.05 0.8793 0.0028 1.7496 − 8.86  ± 0.09 − 1060.14  ± 0.51
  7200 8.02 0.8767 0.0027 1.7703 − 8.89   − 1060.30  
(Ca0.68Mn0.32)CO3a 2400 7.99 1.0529 0.0053 2.0362 − 8.98 − 9.03 − 1028.24 − 1028.56
(Ca0.66Mn0.34)CO3b 4800 8.00 0.9690 0.0041 1.9116 − 9.05  ± 0.06 − 1028.66  ± 0.32
  7200 8.00 0.9715 0.0037 1.8750 − 9.07   − 1028.78  
(Ca0.58Mn0.42)CO3a 2400 8.00 1.0290 0.0060 1.9608 − 9.21 − 9.26 − 996.92 − 997.17
(Ca0.55Mn0.45)CO3b 4800 7.97 1.0181 0.0053 1.9182 − 9.28  ± 0.05 − 997.29  ± 0.25
  7200 7.98 1.0265 0.0048 1.9362 − 9.28   − 997.30  
(Ca0.47Mn0.53)CO3a 2400 7.93 1.1697 0.0080 2.2236 − 9.37 − 9.44 − 962.15 − 962.54
(Ca0.45Mn0.55)CO3b 4800 7.92 1.1162 0.0066 2.0954 − 9.46  ± 0.07 − 962.62  ± 0.38
  7200 7.96 1.0650 0.0054 1.9879 − 9.49   − 962.83  
(Ca0.37Mn0.63)CO3a 2400 7.96 1.4048 0.0107 2.0743 − 9.49 − 9.61 − 930.26 − 930.93
(Ca0.35Mn0.65)CO3b 4800 7.89 1.2750 0.0078 2.0165 − 9.67  ± 0.12 − 931.27  ± 0.67
  7200 7.92 1.1846 0.0073 2.0147 − 9.66   − 931.26  
(Ca0.28Mn0.72)CO3a 2400 7.92 1.0190 0.0104 1.9639 − 9.75 − 9.82 − 902.58 − 902.97
(Ca0.27Mn0.73)CO3b 4800 7.90 1.0256 0.0081 1.9219 − 9.85  ± 0.07 − 903.18  ± 0.39
  7200 7.90 1.0883 0.0077 2.0129 − 9.85   − 903.15  
(Ca0.17Mn0.83)CO3a 2400 8.00 0.9781 0.0124 1.8736 − 9.84 − 9.98 − 867.32 − 868.09
(Ca0.16Mn0.84)CO3b 4800 7.91 0.9155 0.0102 1.7284 − 10.04  ± 0.13 − 868.42  ± 0.76
  7200 7.88 1.0614 0.0092 1.9629 − 10.05   − 868.51  
(Ca0.08Mn0.92)CO3a 2400 7.85 0.6178 0.0246 1.3181 − 10.01 − 10.11 − 839.09 − 839.66
(Ca0.08Mn0.92)CO3b 4800 7.88 0.6963 0.0145 1.4213 − 10.16  ± 0.10 − 839.95  ± 0.56
  7200 7.86 0.7745 0.0140 1.5604 − 10.16   − 839.93  
(Ca0.00Mn1.00)CO3 2400 7.31 0.0000 0.1700 0.5620 − 10.17 − 10.25 − 813.95 − 814.39
  4800 7.34 0.0000 0.1576 0.4657 − 10.25  ± 0.08 − 814.39  ± 0.44
  7200 7.29 0.0000 0.1489 0.4647 − 10.33   − 814.84  
  1. aBulk composition before dissolution; bBulk composition after 300 d of dissolution
  2. cIAP estimated for the bulk composition after 300 d of dissolution