檢視 PH试纸的原始碼

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|<center>'''PH试纸'''<br><img
src="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg30.360buyimg.com%2Fimgzone%2Fjfs%2Ft1%2F179655%2F30%2F10966%2F75690%2F60d34fe6Eeeb0170b%2F4987a9b5074e29ae.jpg&refer=http%3A%2F%2Fimg30.360buyimg.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1670769261&t=b0fa4de9e9b3a1ba065ed0697f5c788e" width="280"></center><small>  圖片來自百度</small> 
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[[化学]]离不开溶液，溶液有[[酸碱]]之分。检验溶液酸碱度的“尺子”是“广泛[[pH试纸]]”，这是一种现成的试纸，使用时，撕下一条，放在[[表面皿]]中，用一支干燥的玻璃棒蘸取一滴待测溶液，或用[[胶头滴管]]吸取溶液滴在试纸中部，再根据试纸的颜色变化与标准比色卡比对就可以知道溶液的酸碱性度，十分方便。pH试纸分为精密试纸和广泛试纸。精密pH试纸的[[比色卡]]和广泛试纸的比色卡不同。广泛pH试纸的比色卡是隔一个[[pH值]]一个颜色，精密pH试纸按测量精度上可分0.5级、0.3级、0.2级或更高精度。