def _deltaKappaCalcite_I75(TempC):
    """Delta and kappa terms for calcite solubility [I75]."""
    deltaVKCa = -48.76 + 0.5304 * TempC
    KappaKCa = (-11.76 + 0.3692 * TempC) / 1000
    return deltaVKCa, KappaKCa
