With a sodium hydroxide solution, which is what baking soda becomes, in low concentrations 1-20% or thereabouts, the freezing point drops to below -20C... but it clibs rapidly back above 0C at 30% concentration by weight. Therefore the concentration should be carefully maintained at 20% or a little lower for best freeze resistance.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
In a home freezer at -5F I found that the cells do not hard freeze, but rather become sort of a slush. I did not break the glass jars. You can add a little ethyl or iso alcohol, but avoid ethylene glycol