The water molecules have the boiling point of 100°C or 212° Other substances have different boiling points.
Accordingly the substance that boils at a lower temperature evaporates first. Organic substances, that have similar boiling point than that of water can slip in the distilled water. Here’s a question. So here is the question. What’s happening in distillation process, this is the case right? Furthermore, if the water contains the oil drops they can be found also in the distillate. As a result, theoretically after the distillation the absolutely pure water is obtained. It is the substance that boils at a lower temperature evaporates first. Various boiling point impurities is higher, when the water has already boiled out. Theoretically, they will begin to evaporate. To eliminate organic problem substances, the water distillers have pre and post water filters. So, now let me tell you something. There’re practically no salts in the distilled water, because the salt boils at a much higher temperature. Fact, since this difference the water is separated.