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Nguyenpham0123
2 năm trước
Cho bột đồng (II) oxit có màu đen tác dụng với 20 gam dung dịch H2SO4 9,8%, sau phản ứng thu được dung dịch A. Cho dung dịch A tác dụng với dung dịch NaOH 8% thu được kết tủa B và dung dịch C. Lọc kết tủa rồi nung đến khối lượng không đổi thu được chất rắn D. a/ Tính nồng độ phần trăm dung dịch A? (2,0 điểm) b/ Tính khối lượng dung dịch NaOH cần dùng để tác dụng vừa đủ với dung dịch A?(0,5điểm) c/ Tính khối lượng chất rắn D? (0,5 điểm) Trả lời đúng ib làm quen luôn😘😘😘
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