三价铁离子的检验 Test for Fe³⁺ ions. 🧪 实验室制氯气 Laboratory preparation of chlorine gas. 🧫 焰色实验 Flame test for metal ions. 🔥 钠与水的反应 Reaction of sodium with water. 💧 配置一定物质的量浓度的溶液 Prepare a solution of a specific molarity. 🦯