{
  "meta": {
    "scope": "Original synthetic closed aqueous acid paths. Not a laboratory export, a validated analytical endpoint, an aquarium intervention or acid-handling instructions. No gas/mineral phases.",
    "execution": "Local deterministic geochemical calculation; no external AI/model API or provider credentials.",
    "wrapper": "phreeqpython 1.6.2",
    "database": "bundled phreeqc.dat, explicitly selected instead of default vitens.dat",
    "databaseSha256": "6bb5ebc1d0ecca0e921c13a2241d05d3a3333b142d1d740b2ed03a786442bdf5",
    "temperatureC": 25,
    "pressureAtm": 1,
    "inputUnitBasis": "mmol/L with density calculate; alkalinity input in equivalent mmol/L",
    "outputConversion": "molality times solvent kg divided by computed solution volume L; do not assume mol/kg water equals mol/L.",
    "carbonAtomicMassConvention": 12.0111,
    "checks": "Every state checks carbon inventory, acid-equivalent alkalinity inventory change, charge, species accounting and carbonate mass action.",
    "basis": "Acid equivalent per initial computed liter; no titrant dilution specified. Zero-alkalinity references are model inventory points, not a universal fixed-pH method endpoint."
  },
  "curves": [
    {
      "label": "A",
      "initialMgLAsCaCO3": 40,
      "initial": {
        "input": {
          "temp": 25,
          "pressure": 1,
          "density": "1 calculate",
          "units": "mmol/L",
          "water": 1,
          "pH": 7.5,
          "Alkalinity": 0.7993605115907274,
          "Na": "0.7993605115907274 charge"
        },
        "pH": 7.5,
        "waterKg": 1,
        "volumeL": 1.002986162152085,
        "densityKgL": 0.9970922008297716,
        "alkalinityMeqL": 0.7993605115897624,
        "dicMmolL": 0.8525762154376537,
        "carbonMgL": 10.240378181243203,
        "carbonateAlkalinityMeqL": 0.7990634623017139,
        "waterAlkalinityMeqL": 0.000297049288048659,
        "borateAlkalinityMeqL": 0,
        "calciumMmolL": 0,
        "sodiumMmolL": 0.7993605115897624,
        "chlorideMmolL": 0,
        "boronMmolL": 0,
        "calciteSI": null,
        "calciteActivityProduct": 1.14722145100607e-105,
        "calciteLogK": -8.479829875153825,
        "speciesMmolL": {
          "(CO2)2": 5.53528306761432e-8,
          "CO2": 0.05482805080145698,
          "CO3-2": 0.0012983368877466203,
          "H+": 0.00003251160949822778,
          "HCO3-": 0.7960960440415705,
          "NaCO3-": 0.00001707148343169892,
          "NaHCO3": 0.00033660151778658136,
          "OH-": 0.0003295608975468621
        },
        "checks": {
          "carbonBalanceResidualMolKg": 1.0842021724855044e-19,
          "manualChargeResidualEq": -1.1859453878295268e-19,
          "manualAlkalinityResidualEqKg": 1.0842021724855044e-19,
          "independentCalciteSI": null,
          "massAction": {
            "bicarbonateLogResidual": 0,
            "co2LogResidual": 0
          }
        }
      },
      "capacityMeqPerInitialLiter": 0.7993605115907274,
      "zeroAlkalinityReference": {
        "acidMeqPerInitialLiter": 0.7993605115907274,
        "pH": 4.714691740583399,
        "alkalinityInventoryMeq": -9.679062228342537e-13,
        "volumeL": 1.0030224132369485
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      "points": [
        {
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    },
    {
      "label": "B",
      "initialMgLAsCaCO3": 120,
      "initial": {
        "input": {
          "temp": 25,
          "pressure": 1,
          "density": "1 calculate",
          "units": "mmol/L",
          "water": 1,
          "pH": 7.5,
          "Alkalinity": 2.3980815347721824,
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        "densityKgL": 0.9971904608463207,
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        "carbonateAlkalinityMeqL": 2.397777725197476,
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        "calciumMmolL": 0,
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        "calciteSI": null,
        "calciteActivityProduct": 3.3663824468531188e-105,
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        "speciesMmolL": {
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        "checks": {
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          "manualChargeResidualEq": -3.7400475088217615e-19,
          "manualAlkalinityResidualEqKg": 4.336808689942018e-19,
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          "massAction": {
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            "co2LogResidual": 0
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      "capacityMeqPerInitialLiter": 2.3980815347721824,
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