Ответы на вопрос:
Na2so3 + h2so4 => na2so4 + h2o + so2 na2co3+h3po4= cuo+hcl= fe(oh)3+h2so4= cao+h2o= cucl2+naoh= bacl2+h2so4= na2so4+bacl2=3 na2co3+2h3po4=2na3po4+3co2+3h2o cuo+2hcl=cucl2+h2o 2fe(oh)3+3h2so4= fe2(so4)3+6h2o cao+h2o=ca(oh)2 cucl2+2naoh= cu(oh)2+2nacl bacl2+h2so4=baso4+2hcl na2so4+bacl2=2nacl+baso4
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