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Table 2 Analytical data and solubility of the (Ca1-xMnx)CO3 solid solutions in air-saturated 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 8.21 0.6677 0.0000 1.2831 − 8.34 − 8.44 − 1129.04 − 1129.63
  4800 8.12 0.6330 0.0000 1.1790 − 8.48  ± 0.10 − 1129.87  ± 0.59
  7200 8.11 0.6323 0.0000 1.1507 − 8.50   − 1129.98  
(Ca0.89Mn0.11)CO3a 2400 8.14 0.7281 0.0031 1.4260 − 8.62 − 8.68 − 1094.68 − 1095.02
(Ca0.88Mn0.12)CO3b 4800 8.13 0.6702 0.0023 1.2751 − 8.72  ± 0.06 − 1095.24  ± 0.34
  7200 8.14 0.6749 0.0025 1.2841 − 8.70   − 1095.13  
(Ca0.78Mn0.22)CO3a 2400 8.04 0.9911 0.0046 1.9561 − 8.74 − 8.83 − 1059.46 − 1059.92
(Ca0.76Mn0.24)CO3b 4800 8.07 0.8657 0.0026 1.7596 − 8.85  ± 0.08 − 1060.06  ± 0.46
  7200 8.03 0.8708 0.0030 1.7536 − 8.88   − 1060.22  
(Ca0.68Mn0.32)CO3a 2400 7.99 1.0729 0.0052 2.0771 − 8.99 − 9.04 − 1028.19 − 1028.46
(Ca0.65Mn0.35)CO3b 4800 8.01 1.0029 0.0039 1.9388 − 9.06  ± 0.05 − 1028.55  ± 0.27
  7200 8.02 0.9766 0.0039 1.8492 − 9.07   − 1028.64  
(Ca0.58Mn0.42)CO3a 2400 8.01 1.0624 0.0057 2.0395 − 9.21 − 9.28 − 996.79 − 997.16
(Ca0.54Mn0.46)CO3b 4800 8.02 0.9609 0.0043 1.8495 − 9.32  ± 0.07 − 997.37  ± 0.37
  7200 7.98 1.0321 0.0049 1.9072 − 9.31   − 997.31  
(Ca0.47Mn0.53)CO3a 2400 7.96 1.0554 0.0091 2.0089 − 9.39 − 9.45 − 962.13 − 962.49
(Ca0.44Mn0.56)CO3b 4800 7.97 1.1016 0.0058 2.0568 − 9.47  ± 0.07 − 962.57  ± 0.36
  7200 7.94 1.0914 0.0058 2.0347 − 9.51   − 962.78  
(Ca0.37Mn0.63)CO3a 2400 8.00 1.4088 0.0100 2.0973 − 9.48 − 9.62 − 930.11 − 930.87
(Ca0.34Mn0.66)CO3b 4800 8.01 1.1903 0.0062 1.6380 − 9.73  ± 0.13 − 931.48  ± 0.76
  7200 7.96 1.1889 0.0073 2.0109 − 9.64   − 931.02  
(Ca0.28Mn0.72)CO3a 2400 7.93 1.0275 0.0095 1.9579 − 9.79 − 9.82 − 902.68 − 902.89
(Ca0.26Mn0.74)CO3b 4800 7.98 1.0251 0.0074 1.9515 − 9.82  ± 0.05 − 902.84  ± 0.26
  7200 7.92 1.0789 0.0074 1.9774 − 9.87   − 903.14  
(Ca0.17Mn0.83)CO3a 2400 7.90 0.9976 0.0102 1.8802 − 10.01 − 10.02 − 868.28 − 868.33
(Ca0.16Mn0.84)CO3b 4800 7.93 1.0205 0.0092 1.9245 − 10.01  ± 0.02 − 868.26  ± 0.11
  7200 7.86 1.0598 0.0101 1.9521 − 10.04   − 868.44  
(Ca0.08Mn0.92)CO3a 2400 7.65 0.6258 0.0256 1.3296 − 10.21 − 10.23 − 840.16 − 840.23
(Ca0.07Mn0.93)CO3b 4800 7.66 0.7201 0.0199 1.5022 − 10.26  ± 0.03 − 840.40  ± 0.17
  7200 7.75 0.7722 0.0169 1.5735 − 10.21   − 840.13  
(Ca0.00Mn1.00)CO3 2400 7.29 0.0000 0.1871 0.5449 − 10.16 − 10.26 − 813.92 − 814.46
  4800 7.31 0.0000 0.1419 0.5413 − 10.26  ± 0.10 − 814.47  ± 0.54
  7200 7.34 0.0000 0.1380 0.4123 − 10.35   − 815.00  
  1. aBulk composition before dissolution; bBulk composition after 300 d of dissolution;
  2. cIAP estimated for the bulk composition after 300 d of dissolution