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H2SO4 + Ba --> BaSO4 + H2
H2SO4 + BaO --> BaSO4 + H2O
H2SO4 + Ba(OH)2 --> BaSO4 + 2H2O
otrzymywanie soli z bromku potasu
2HBr + 2K -->2 KBr + H2
2HBr + K2O ---> 2KBr + H2O
HBr + KOH --> KBr + H2O