Sun, 03 May 2026 14:58:53 +0000

Unbelievable Mistake When You Pour Water on Calcium Oxide—You Won’t Believe What Happens Next Pouring water on calcium oxide (CaO)—a highly reactive chemical compound—might seem like a harmless experiment, but it’s one of the most dramatic—and dangerous—mistakes you can make. If you’ve ever wondered, “What happens when water meets calcium oxide?” prepare to be shocked. This simple action triggers a violent exothermic reaction that can cause fiery eruptions, splattering, and even minor injuries. Let’s dive deep into this jarring reaction and why you absolutely should never attempt it at home or in a lab. ### The Chemistry Behind the Mistake Calcium oxide is a strong, porous alkaline powder commonly used in construction (as Portland cement), soil treatment, and industrial processes. When water is added, a highly exothermic reaction occurs: