The pH of pure liquid water depends on temperature. It is about pH = 7.0 at room temperature, pH = 6.1 at 100 °C, and pH = 7.5 at 0 °C. What happens to the pH (or to the ion product) of pure water when it freezes?
I assume that the proton transfer reactions 2HX2O−⇀↽−HX3OX++OHX−
HX3OX++HX2O−⇀↽−HX2O+HX3OX+
HX2O+OHX−−⇀↽−OHX−+HX2O
are too fast, so that any present HX3OX+ and OHX− cannot be easily trapped in the solid ice crystal when it grows. Does that mean that pure ice crystals are free of HX3OX+ and OHX− ions?
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