【化学小实验】用碱和白醋让蜡烛熄灭（成功了？！？！）
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| VIDEOS | |||
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
| AUDIO | |||
| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
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碳酸钠与醋酸反应生成二氧化碳，二氧化碳本身不燃烧，也不支持燃烧，且密度比空气大。（所以蜡烛熄灭）
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