檢視石蕊试纸的原始碼

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| style="background: #FF2400" align= center|  '''<big>石蕊试纸</big>'''
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中文名；石蕊试纸

外文名；litmus paper

发明者；罗伯特·波义耳

用途；检验溶液的酸碱性

分类；红色石蕊试纸和蓝色石蕊试纸
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'''石蕊试纸'''是常用的试纸，是检验溶液的酸碱性最古老的其中一种方式。分为有红色[[石蕊试纸]]和蓝色石蕊试纸两种。 碱性溶液使红色试纸变蓝，酸性溶液使蓝色试纸变红。严格而言，在室温及1大气压力情况下，pH值高于8.3时红石蕊试纸才会变蓝，而pH值低于4.5时蓝石蕊试纸才会变红。换句话说，pH值介乎4.5及8.3时红蓝石蕊试纸是不会变色的。所以在测试接近中性的溶剂时会不大准确。 石蕊试纸由石蕊[[溶液]]浸渍滤纸，晾干得到。<ref>[https://www.360kuai.com/pc/9adc86dc7efc575af?cota=3&kuai_so=1&tj_url=wd&sign=360_57c3bbd1&refer_scene=so_1 石蕊试纸的作用],快资讯 , 2013-03-24</ref>