def as_dict(self):
        """
        Returns dict which contains Pourbaix Entry data.
        Note that the pH, voltage, H2O factors are always calculated when
        constructing a PourbaixEntry object.
        """
        d = {"@module": self.__class__.__module__,
             "@class": self.__class__.__name__}
        if isinstance(self.entry, IonEntry):
            d["entry_type"] = "Ion"
        else:
            d["entry_type"] = "Solid"
        d["entry"] = self.entry.as_dict()
        d["concentration"] = self.concentration
        d["entry_id"] = self.entry_id
        return d
Returns dict which contains Pourbaix Entry data.
        Note that the pH, voltage, H2O factors are always calculated when
        constructing a PourbaixEntry object.