Cho các chất sau: CaO, SO2, SO3, Fe2O3, Ba(OH)2, Fe(OH)2, Cu, HCl, Zn. Lập PTHH + cân bằng a. Chất nào tác dụng với nước? b. Chất nào tác dụng với hydrochloric acid? c. Chất nào tác dụng với sodium hydroxide?

2 câu trả lời

$a,\ CaO;\ SO_2;\ SO_3\\ CaO+H_2O\to Ca(OH)_2\\ SO_2+H_2O\to H_2SO_3\\ SO_3+H_2O\to H_2SO_4\\ b,\ CaO;\ Fe_2O_3;\ Ba(OH)_2;\ Fe(OH)_2;\ Zn\\ CaO+2HCl\to CaCl_2+H_2O\\ Fe_2O_3+6HClto 2FeCl_3+3H_2\\ Ba(OH)_2+2HCl\to BaCl_2+2H_2O\\ Fe(OH)_2+2HCl\to FeCl_2+2H_2O\\ Zn+2HCl\to ZnCl_2+H_2\\ c,\ SO_2;\ SO_3;\ HCl\\ SO_2+NaOH\to NaHSO_3\\ SO_3+2NaOH\to Na_2SO_4+H_2O\\ HCl+NaOH\to NaCl+H_2O$

 

Đáp án:

 

Giải thích các bước giải:

`a)` Tác dụng với nước `(H_2O): CaO, SO_2, SO_3`

`CaO + H_2 O -> Ca(OH)_2`

`SO_2 + H_2 O -> H_2 SO_3`

`SO_3 + H_2 O -> H_2 SO_4`

`b)` Tác dụng với hydrochloric acid `(HCl): CaO, Fe_2 O_3, Ba(OH)_2, Fe(OH)_2, Zn`

`CaO + 2HCl -> CaCl_2 + H_2 O`

`Fe_2 O_3 + 6HCl -> 2FeCl_3 + 3H_2 O`

`Ba(OH)_2 + 2HCl -> BaCl_2 + 2H_2 O` 

`Fe(OH)_2 + 2HCl -> FeCl_2 + 2H_2 O`

`Zn + 2HCl -> ZnCl_2 + H_2`

`c)` Tác dụng với sodium hydroxide `(NaOH): SO_2, SO_3, HCl`

`{(SO_2 + 2NaOH -> Na_2 SO_3 + H_2 O),(SO_2 + NaOH -> NaHSO_3):}`

`{(SO_3 + 2NaOH -> Na_2 SO_4 + H_2 O),(SO_3 + NaOH -> NaHSO_4):}`

`HCl + NaOH -> NaCl + H_2 O`

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