Explanation:

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By adding benzene (warning: toxic!) 100% pure ethanol can be produced, since the benzene forms an azeotrope with the water

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Ethanol & methanol

Ethanol or more commonly called alchohol . its a liquid at room temperature . though its quite volatile . it is used in almost all beverages .

we "humans" consume dilute alchohol to a decent amount of extent and it is called drunkness .

It has other industrial use , its a very good solvent . it is used in sanitizer , almost 95% of sanitizer is alcohol . It has a high medical use . For example , it's used for making medical wipes , antiseptic to kill infection .It's also used in mouthwash to kill harmful germs .

Note : Use of mouthwash exceeding limit can be harmful . How ? It may kill some useful bacteria existing in your mouth which is a part of your immune system who restricts the harmful foreign bacteria from entering your mouth to stomach .

If a large amount of alchohol is consumed by human beings it may slow down there metabolic process . Though Methanol is produced in metabolic process of human .but excessive production has also the capability to slow down metabolic process .

But if you consume Methanol (used to treat alchohol that is used in the industry) . its called denaturing alchohol . Why because it's used to denature alcohol . And methanol is such a richest person that he has another name called "wood alchohol" . He got this name as it was by distillation of wood. A little amount of methanol is added to ethanol to denature it . methanol is an extremly harmful substance . Sometimes consuming too much ethanol end up becoming methanal inside our body and now it badly harms optic and other systems . It is a very harmful thing . Let me leave that to you , go and find about it if you so curious !