alcohol mix in alcohol why it's exothermic
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Ethanol has two lone pairs of electrons and one δ+ hydrogen. In pure ethanol there are not enough δ+ hydrogens for every lone pair. Bond making is exothermic. Liquids expand when they are heated.
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Upon dilution in water, the alcohol is inserted in a weak chain and renders the adjacent water-bond strong. As a consequence, the dilution of an alcohol in water is always exothermic. The dilution of water in an alcohol causes stabilisation of the H-bonds but has a negative effect on the non-specific cohesion.
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