Đọc kĩ đề bài và giải giúp tớ với Nhỏ từ từ từng giọt cho đến hết 200 ml dd KHCO 3 0,2M; K 2 CO 3 0,5M vào 120 ml dd HCl 1M và khuấy đều thu được V lít CO 2 thoát ra (đktc) và dd X. Thêm 100 ml dd KOH 0,15M; CaCl 2 0,6M vào dd X, thu được m g kết tủa. Biết các phản ứng xảy ra hoàn toàn. Tính V và m?

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