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191问答库 > 溶液加入酚酞30秒不褪色时ph为多少?

溶液加入酚酞30秒不褪色时ph为多少?

溶液加入酚酞30秒不褪色时ph为多少?

2025-03-16 08:23:57

推荐回答（2个）

回答1：

石蕊变色范围 PH5.8——8.0 由红色变为蓝色　
甲基橙变色范围 PH3.1——4.4 由红色变为黄色　
酚酞变色范围 PH8.2——10.0 由无色变为红色
酚酞的不变色，pH<8.2

回答2：

这没办法判断，光看颜色深浅是肉眼无法分辨的，变色范围8.0无色-10.0红紫色，pH10以上都是红紫色的了，只能说明溶液呈碱性，想测具体的pH值可以用精密pH试纸或者pH计

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