璀璨星云——乙醇凝胶的焰色与变色

doi:10.3866/PKU.DXHX202209083

Abstract

Abstract:

The experiment is a comprehensive popular science experiment designed on the basis of supramolecular gels preparation, combining the two common principles of flame test and color change of indicator. In the preparation of gel, calcium acetate solution and ethanol were mixed first, metal salt (or boric acid) and acid-base indicator were added. When the gel was ignited, the gel showed colored flame because of the metal salt (or boric acid). The heat leads to hydrolytic equilibrium shift of acetate in the gel, leading to the color change of acid-base indicator in the gel. The exhibition effect of experiment is gorgeous and colorful, just like the bright nebula shining in the universe. The experiment is safe and easy to operate, involving rich knowledge, possessing obvious phenomenon, and showing adequately the beauty of chemistry, which can well meet the learning needs of different groups of people.

Key words: Supramolecular gel, Flame test, Acid-base indicator, Science popularization of chemistry

Lai Wei, Mei Ni, Yancen Liu. Bright Nebula: Flame and Color Change of Ethanol Gels[J].University Chemistry, 2023, 38(7): 289-296.

Figures/Tables 6

References 17

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组别	序号	所含金属盐(或硼酸) ^a	酸碱指示剂^b/mL	乙醇溶液/mL	乙酸钙溶液/mL	焰色	成凝时颜色	燃烧时变色
Ⅰ	a	–	–	95%乙醇10.0	溶液A 2.0	砖红	白色	–
	b	氯化锂	–	溶液B 10.0	溶液A 2.0	紫红	白色	–
	c	氯化钠	–	95%乙醇10.0	溶液A 2.0 + 溶液C 0.5	黄色	白色	–
	d	硼酸	–	悬浊液E 10.0	悬浊液F 2.0	绿色	白色	–
	e	氯化铯	–	95%乙醇10.0	溶液D 2.0	浅紫	白色	–
Ⅱ	a	–	酚酞指示剂1.0	95%乙醇10.0	溶液A 3.0	砖红	白色	变红
	b	–	苯酚红指示剂1.0	95%乙醇10.0 + 乙酸0.5	溶液A 3.0	砖红	黄色	变粉红
	c	–	苯酚红指示剂1.0	95%乙醇10.0 + 溶液G 0.5	溶液A 3.0	砖红	红色	先变黄，再变粉红
	d	–	甲基红指示剂1.0	95%乙醇10.0 + 乙酸0.5	溶液A 3.0	砖红	橙红色	变黄
	e	–	溴百里酚蓝指示剂1.0	95%乙醇10.0 + 乙酸0.5	溶液A 3.0	砖红	黄色	变蓝
	f	–	溴百里酚蓝指示剂1.0	95%乙醇10.0 + 溶液G 0.5	溶液A 3.0	砖红	深蓝色	先变黄，再变蓝
	g	–	溴甲酚紫指示剂1.0	95%乙醇10.0 + 乙酸0.5	溶液A 3.0	砖红	黄色	变蓝
Ⅲ	a	–	苯酚红指示剂1.0	95%乙醇10.0 + 溶液G 0.5	溶液A 2.0	砖红	红色	先变黄，再变粉红
	b	氯化锂	溴百里酚蓝指示剂1.0	溶液B 10.0 + 溶液G 0.5	溶液A 2.0	紫红	深蓝色	先变浅绿，再变蓝
	c	氯化钠	酚酞指示剂1.0	95%乙醇10.0	溶液A 2.0 + 溶液C 0.5	黄色	白色	变红
	d	硼酸	苯酚红指示剂1.0	悬浊液E 10.0 + 乙酸0.5	悬浊液F 2.0	绿色	黄色	变橙
	e	氯化铯	溴百里酚蓝指示剂1.0	95%乙醇10.0 + 乙酸0.5	溶液D 2.0	浅紫	黄色	变蓝

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Bright Nebula: Flame and Color Change of Ethanol Gels

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