Верно ли я решил?
K2SO4 + BA(NO3)2 = BaSO4 + 2KNO3
следовательно 2K + SO4 + Ba + 2NO3 = BaSO4 (стрелка вниз) + 2K + 2NO3
 следовательно Ba + SO4 = BaSO4 (стрелка вниз)
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