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sục V lít CO2 vào dd nước vôi trong nồng độ 1M thấy xuất hiện 20 g kết tủa lọc kết tủa dd còn lại cho qua dd NaOH dư thấy xuất hiện 20 g kết tủa nữa a)tính V. b) tính thể tích dd Cu(OH)2 1M
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