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b) 2Na + H2SO4 = Na2SO4 + H2 wymiany
d) 3KOH + H3PO4 = K3PO4 + 3H2O wymiany
b) 2 Na + H2SO4 = Na2SO4 + H2---------wymiana pojedyncza
d) 3 KOH + H3PO4 = K3PO4 + 3 H2O----wymiana podwójna