I'm making soft boiled eggs and I looked at a recipe (because last time I had bad luck) and this one says to add a bit of baking soda to the water (I have no idea what it will do, I'm just following directions). Anyways, the water will NOT go above 210 degrees. I cannot get a rolling boil, only a simmer. How does the baking soda prevent the water from actually boiling? Adding bicarbonate to the water creates an exothermic reaction and should actually RAISE the temperature, not prevent it from rising.