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元明粉如何检测

更新时间: 2020-10-29 00:00:00     

元明粉即硫酸钠,检测方法如下:将待测固体制成溶液,向其中加入氯化钡溶液,产生白色沉淀,加入稀盐酸,沉淀不消失,证明有硫酸根。取固体少量,用沾了蒸馏水的干净铂丝蘸取固体,在铂丝表面形成溶液。放在酒精灯焰上灼烧,如果火焰变黄,则说明有钠离子,综上可以证明硫酸钠的存在。硫酸钠(Na₂SO₄)是硫酸根与钠离子化合生成的盐,硫酸钠溶于水,其溶液大多为中性,溶水时为碱性,溶于甘油而不溶于乙醇。无机化合物,高纯度、颗粒细的无水物称为元明粉。元明粉,白色、无臭、有苦味的结晶或粉末,有吸湿性。

关键词: 如何 检测

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