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制取彩色的“固体”酒精

制取彩色的“固体”酒精. 背景和原理. 酒精和水可以任意比例混溶 , 醋酸钙只溶于水而不溶于酒精。当饱和醋酸钙溶液注入酒精时 , 溶液中的水溶解于酒精而使醋酸钙从酒精溶液中析出 , 呈半固态的凝胶状。若事先在酒精中滴入品红等有色物质的浓溶液 , 就会制出彩色的“固体”酒精。. 操作步骤. 1. 量取 20mL 蒸馏水注入小烧杯中 , 加入适量醋酸钙制成醋酸钙饱和溶液。 2. 在另一烧杯中加入 25mL 无水酒精 , 先向其中加入某有色物质的浓溶液 , 再慢慢注入约 15mL 饱和醋酸钙溶液 , 用玻璃棒不断搅拌 , 烧杯中的物质很快变稠并不再流动 , 形成彩色的“固体”酒精。

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制取彩色的“固体”酒精

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  1. 制取彩色的“固体”酒精

  2. 背景和原理 • 酒精和水可以任意比例混溶,醋酸钙只溶于水而不溶于酒精。当饱和醋酸钙溶液注入酒精时,溶液中的水溶解于酒精而使醋酸钙从酒精溶液中析出,呈半固态的凝胶状。若事先在酒精中滴入品红等有色物质的浓溶液,就会制出彩色的“固体”酒精。

  3. 操作步骤 • 1.量取20mL蒸馏水注入小烧杯中,加入适量醋酸钙制成醋酸钙饱和溶液。 • 2.在另一烧杯中加入25mL无水酒精,先向其中加入某有色物质的浓溶液,再慢慢注入约15mL饱和醋酸钙溶液,用玻璃棒不断搅拌,烧杯中的物质很快变稠并不再流动,形成彩色的“固体”酒精。 • 3.取出“固体”酒精,捏成一定形状,放在蒸发皿中点燃,“固体”酒精立即着火并发出蓝色的火焰。

  4. 四、思考与探究 • 如果醋酸钙溶液的浓度不够，会出现什么情况呢？

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