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Caffeine is actually a non-polar substance, and normally would not dissolve in water, but since it contains some polar bonds it is able to dissolve in hot water. This is how they decaffeinate coffee, the coffee beans are soaked in hot water and all the flavoring, caffeine and aroma are extracted. Then it is put through a carbon filter which holds back all the caffeine so the flavoring and aroma can be added back into the bean, roasted, and ground to make you morning cup of decaffeinated coffee!

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