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技巧 1:蓝石蕊试纸变红后恢复蓝色1广口瓶 1 2 5ｍＬ2变质试纸3窗砂4浓氨水 1 0ｍＬ图 1 化学实验中要检验酸性气体如二氧化硫一般用蓝石蕊试纸 ,而实验室内有大量挥发出来的氯化氢等酸性气体 ,致使蓝石蕊试纸在实验室中保存一段时间后变成红色 ,要想使其恢复蓝色可用如图 1
Tip 1: After the blue litmus paper turns red, it recovers blue. 1 Wide mouth bottle 1 2 5mL2 Metamorphic test paper 3 Window sand 4 Concentrated ammonia 1OmL Figure 1 Chemical experiment to test acidic gases such as sulfur dioxide is generally used blue litmus paper, and experiments There are a large number of acid gases such as hydrogen chloride that are volatilized out of the room, causing the blue litmus paper to turn red in the laboratory for a period of time. To make it recoverable, use it as shown in Figure 1.