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Viết phản ứng xảy ra khi dùng HF để khắc chữ trên thủy tinh.
SiO2 + 4HF → SiF4 + 2H2O.
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Hoàn thành PTHH sau: Si + F2 -> ...
SiF6
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Hoàn thành PTHH sau: Si + NaOH + H2O -> ...
Na2SiO3 + H2
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Cho 7 gam hỗn hợp hai muối cacbonat của kim loại hoá trị II tác dụng hết với dung dịch HCl thấy thoát ra x lít khí ở đktc. Dung dịch thu được đem cô cạn thấy có 9,2 gam muối khan. Tính giá trị của x.
4,48
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Dẫn khí CO2 từ từ đến dư vào dung dịch nước vôi trong. Xác định muối tạo thành sau PƯ.
Ca(HCO3)2
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Hòa tan hoàn toàn 23,8 gam hỗn hợp muối cacbonat của hai kim loại bằng dung dịch HCl thấy thoát ra 4,48 lít khí CO2 (đktc). Khi cô cạn dung dịch thu được sau phản ứng thì khối lượng muối khan thu được là bao nhiêu gam?
26 gam
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Hấp thụ hoàn toàn a mol khí CO2 vào dung dịch chứa b mol Ca(OH)2 thì thu được hỗn hợp hai muối CaCO3 và Ca(HCO3)2. Lập biểu thức mối quan hệ giữa a và b.
b < a < 2b.
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Hấp thụ hoàn toàn 2,24 lít CO2 (đktc) vào dung dịch nước vôi trong có chứa 0,075 mol Ca(OH)2. Xác định muối tạo thành sau PƯ.
CaCO3 và Ca(HCO3)2.
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Khi cho khí CO2 vào dung dịch bazơ, để xác định loại muối tạo thành cần phải lập tỉ lệ
nOH- : nCO2.
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