Answer to Question #16143 in Physical Chemistry for sara
white solid. In the case of NaOH or Ca(OH)2 or KOH it is physical changes,cause
water "destroys bond" between Me^x+ and xOH^. The same with kind of salts
Mex(A)y <---> xMe^y+ + yA^x- ,but in the case with alkali solid become
hot,and with salts in can become cold or hot.
But in the case,when white
solid is Na2O or CaO or other white solid oxide of some active metals it's
Na2O + H2O -->2NaOH and this reaction produced heat.
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