Why do we need to heat metal+base in order to get salt+water?
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If you are using an alkali - which is a soluble base - then you need to add just enough acid to make a neutral solution (check a small sample with universal indicator paper).
Warm the salt solution to evaporate the water. You get larger crystals if you evaporate the water slowly.
Copper oxide and other transition metal oxides or hydroxides do not dissolve in water. If the base is insoluble, then an extra step is needed to form a salt.
You add the base to the warm acid until no more will dissolve and you have some base left over – this is called an ‘excess’. You filter the mixture to remove the excess base, and then evaporate the water in the filtrate to leave the salt behind.
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Warm the salt solution to evaporate the water. You get larger crystals if you evaporate the water slowly.
Copper oxide and other transition metal oxides or hydroxides do not dissolve in water. If the base is insoluble, then an extra step is needed to form a salt.
You add the base to the warm acid until no more will dissolve and you have some base left over – this is called an ‘excess’. You filter the mixture to remove the excess base, and then evaporate the water in the filtrate to leave the salt behind.
Hope this answer will help you
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