19.已知 (BaS(O)_(4))=1.07times (10)^-10 , (BaC(O)_(3))=2.58times (10)^-9 ,在1LNa2 CO3溶液中,转-|||-0.020molBaSO4固体.问此Na2CO3溶液的最初浓度为多少:-|||-

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