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在蒸馏水等软水中放入少许干净的大理石等地表物质后振荡或加热片刻,软水就会慢慢变成硬水,本文还介绍了选用酚酞指示剂来验证硬水的简易方法及该方法的基本原理。
In soft water such as distilled water put a little clean marble and other surface substances after shaking or heating for a while, soft water will slowly become hard water, this article also describes the use of phenolphthalein indicator to verify the simple method of water and the basic principles of the method.