Question

why substance like MgCl2 and CaCl2 are not used to remove water from alcohol
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Answer 1

unfortunately, water is a compound that is very difficult to remove from many compounds ,because they are either holding on to it well (i. e.. alcohols) or the compound itself is stem volatile..

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Answer 2

MgCl2 AND CaCl2 CANNOT BE USED TO REMOVE WATER FROM ALCOHOL AS THEY FORM AN ADDITION COMPOUND WITH ALCOHOL.

Explanation:

• Dehydrating agents are those which are capable of removing water molecules from a compound.
• These absorbs the water molecules and make it anhydrous.
• Calcium chloride and magnesium chloride are dehydrating agents but when used with alcohol to dehydrate them, they form an addition compound with alcohol instead of removing water.
• Calcium chloride forms $CaCl_{2} .4C_{2}H_{5}OH$ and Magnesium chloride forms MgCl2-ethanol adduct.
• This is whey they can't be used to remove water from alcohol.