Pure calcium carbonate in pure water? Nope, it doesn’t dissolve. It’s a tough, stubborn mineral that plays hard to get.
But if you change the rules of the game—add some acid or inject CO₂ gas into the water—it suddenly becomes a willing participant, fizzing and turning into a whole new set of molecules. It’s a perfect reminder that in chemistry, context is everything, and the most boring answer is usually hiding a very wild party.
Next time you see a limestone cliff or a seashell, just remember: they’re not really permanent. They’re just waiting for the right, slightly sour moment to become a part of the water.
