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Fe + HCl - > Fecl2 + H2
2FeCl2 + NaClO + 4NaOH + H2O -> 5NaCl + 2Fe(OH)3
2Fe(OH)3 -^t0-> Fe2o3 + 3H2O
Fe2O3 + 3H2 -t0-> 2Fe + 3H2O
* cái đâu tiên là \(FeCl_3\) không phải \(FeCl_2\)
\(Fe+Cl-->FeCl_3\)
\(FeCl_3+3NaOH-->Fe\left(OH\right)_3+3NaCl\)
\(2Fe\left(OH\right)_3-->Fe_2O_3+3H_2O\)
\(2Fe\left(OH\right)_3-->Fe_2O_3+3H_2O\)
1) P2O5+H2O−>H3PO4
10) Na2O+H2O−>NaOH
2) CO2+H2O−>H2CO3
11) CaO + H2O−>Ca(OH)2
3) SO2+H2O−>H3SO3
12) BaO + H2O−>Ba(OH)2
4) SO3+H2O−>H2SO4
13) K2O+H2O−>.KOH
5) N2O5+H2O−>HNO3
14) Fe2O3+HCL−>FeCl3+H20
6) ......H3PO4.... + NaOH -> Na3PO4+H2O
15) ......MgO..+ H2SO4−>MgSO4+H2O
7) .CO2+ Ca(OH)2−>CaCO3+H2O
16) .KOH.....+H3PO4−>K3PO4+H2O
8) SO2...+ KOH -> K2SO3+H2O
17) .CaO+.CO2 ->CaCO3
9) .HNO3.+ Ba(OH)2−>Ba(NO3)2+H2O
18) .H3PO4.+..NaOH -> Na3PO4
a) \(S+O2\rightarrow SO2\)
2SO2+O2---->2SO3
SO3+H2O--->H2SO4
H2SO4+Na2O---->Na2SO4+H2O
Na2SO4+BaCl2---->2NaCl+BaSO4
b) 2Ca+O2--->2CaO
CaO+H2O--->Ca(OH)2
Ca(OH)2+CO2---->CaCO3+H2O
CaCO3+H2SO4----> CaSO4+H2O+CO2
CaSO4+BaCl2--->CaCl2+BaSO4
a,
\(1.\text{O2 + S → SO2}\)
\(2.\text{O2 + 2SO2 ↔ 2SO3}\)
\(3.\text{H2O + SO3 → H2SO4}\)
\(3.\text{H2SO4 + 2NaOH → 2H2O + Na2SO4}\)
\(4.\text{BaCl2 + Na2SO4 → 2NaCl + BaSO4}\)
b,
\(1.2Ca+O2\rightarrow2CaO\)
\(2.\text{CaO + H2O → Ca(OH)2}\)
\(3.\text{Ca(OH)2 + CO2 → CaCO3 + H2O}\)
\(4.\text{CaCO3 + H2SO4 → H2O + CO2 + CaSO4}\)
\(5.\text{BaCl2 + CaSO4 → CaCl2 + BaSO4}\)
\(1.\\ CuSO_4\underrightarrow{\left(1\right)}Cu\left(OH\right)_2\underrightarrow{\left(2\right)}CuO\underrightarrow{\left(3\right)}CuCl_2\underrightarrow{\left(4\right)}NaCl\\ \left(1\right)CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\\ \left(2\right)Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\\ \left(3\right)CuO+2HCl\rightarrow CuCl_2+H_2O\\ \left(4\right)CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)
2.
- Trích mẫu thử, cho quỳ tím vào các mẫu thử:
+ Hóa xanh: NaOH
+ Không hiện tượng: Na2SO4 và NaCl (A)
- Cho dd BaCl2 vào nhóm (A) nếu:
+ Kết tủa: Na2SO4
+ Không ht: NaCl
( Tự viết các PTHH)
1)
CuSO4+2 NaoH----->Cu(OH)2+Na2SO4
Cu(OH)2--->CuO+H2O
CuO+HCl--->CuCl2+H2O
CuCl2+ 2NaOH---->Cu(OH)2+2NaCl
2) -Cho Qùy tím vào
+Mẫu thử làm quỳ tím hóa xanh là NaOH
+Mẫu thử ko làm qt chuyển màu là Na2SO4 và NaCl
-cho BaCl2 vào NaCl và Na2SO4
+Có kết tủa là Na2SO4
Na2SO4+BaCl2---->2NaCl+BaSO4
+K ht là NaCl
a) 4Al+3O2--->2Al2O3
Al2O3+6HCl--->2AlCl3+3H2O
2AlCl3+ 3H2SO4--->Al2(SO4)3+6HCl
Al2(SO4)3+6NaOH----> 2Al(OH)3+3Na2SO4
b) FeCl2+2 NaOH--->Fe(OH)2+2NaCl
Fe(OH)2---->FeO+H2O
FeO+H2-->Fe+H2O
Fe+Cl2---->FeCl2
2FeCl2+Cl2--->2FeCl3
FeCl3+3NaOH--->Fe(OH)3+3NaOH
2Fe(OH)3---->Fe2O3+3H2O
Fe2(SO4)3+3HNO3---->Fe(NO3)3+3H2SO4
\(\left(1\right)2Fe+3Cl_2\rightarrow2FeCl_3\)
\(\left(2\right)FeCl3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)
\(\left(3\right)2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe2O3+3H_2O\)
\(\left(4\right)Fe_2O_3+3H_2-^{t^o}\rightarrow2Fe+3H_2O\)
1) 2Fe + 3Cl2 -> 2FeCl3
2) FeCl3 + 3NaOH -> 3NaCl + Fe(OH)3
3) 2Fe(OH)3 -to-> Fe2O3 + 3H2O
4) Fe2O3 + 3CO -to->2 Fe + 3CO2
2NaOH + Cu(NO3)2 -> Cu(OH)2 + 2NaNO3
AgNO3 + HCl -> AgCl + HNO3
K2SO4 + Ba(NO3)2 -> BaSO4 + 2KNO3
Mg + H2SO4 -> MgSO4 + H2
1.
\(2KClO_3\rightarrow2KCl+3O_2\)
\(4K+O_2\rightarrow2K_2O\)
\(K_2O+H_2O\rightarrow2KOH\)
\(2KOH+H_2SO_4\rightarrow K_2OSO_4+2H_2O\)
\(K_2SO_4+BaCl_2\rightarrow2KCl+BaSO_4\)
\(2KCl+2H_2O\rightarrow2KOH+Cl_2+H_2\)
2.
\(Cu+H_2SO_{4_{dac}}\rightarrow CuSO_4+SO_2+2H_2O\)
\(CuSO_4+BaCl_2\rightarrow CuCl_2+BaSO_4\)
\(CuCl_2+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2AgCl\)
\(Cu\left(NO_3\right)_2+2NaOH\rightarrow NaNO_3+Cu\left(OH\right)_2\)
\(Cu\left(OH\right)_2\rightarrow CuO+H_2O\)
\(CuO+H_2\rightarrow Cu+H_2O\)
3.
\(4Al+3O_2\rightarrow2Al_2O_3\)
\(Al_2O_2+6HCl\rightarrow2AlCl_3+3H_2O\)
\(AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\)
\(2Al\left(OH\right)_2\rightarrow Al_2O_3+H_2O\)
\(2Al_2O_3\rightarrow4Al+3O_2\)
\(2Al+2NaOH+2H_2O\rightarrow2NaAlO_2+3H_2\)
4.
\(C+O_2\rightarrow CO_2\)
\(CO_2+C\rightarrow2CO\)
\(2CO+O_2\rightarrow2CO_2\)
\(CO_2+NaOH\rightarrow NaHCO_2\)
\(NaHCO_3+NaOH\rightarrow Na_2CO_3+H_2O\)
\(Na_2CO_3+CaCl_2\rightarrow2NaCl+CaCO_3\)
\(CaCO_3\rightarrow CaO+CO_2\)
5.
\(Cl_2+H_2\rightarrow2HCl\)
\(4HCl+MnO_2\rightarrow MnCl_2+Cl_2+2H_2O\)
\(Cl_2+2NaOH\rightarrow NaCl+NaClO+H_2O\)
\(2NaC+2H_2O\rightarrow2NaOH+Cl_2+H_2\)
\(Cl_2+2NaOH\rightarrow NaCl+NaClO+H_2O\)
Viết PTHH biễu diễn chỗi biến hóa:
1) 2KClO3 -->2KCl+3O2
O2+4K-->2K2O
K2O+H2O-->2KOH
2KOH+H2SO4-->K2SO4+2H2O
K2SO4+BaCl2-->2KCl+BaSO4
2KCl-->Cl2+2K
2) Cu+FeSO4-->CuSO4+Fe
CuSO4+BaCl2-->CuCl2+BaSO4
CuCl2+2AgNO3-->Cu(NO3)2+2AgCl
Cu(NO3)+2NaOH-->Cu(OH)2+2NaNO3
Cu(OH)2-->CuO+H2O
2CuO-->2Cu+O2
3)4Al+3O2-->2Al2O3
Al2O3+6HCl-->2AlCl3+3H2O
2AlCl3+6NaOH-->2Al(OH)3+6NaCl
2Al(OH)3-->Al2O3+3H2O
2Al2O3-->4Al+3O2
2Al+2H2O+2NaOH-->2NaAlO2+3H2
4)C+O2-->CO2
CO2+C-->2CO
2CO+O2---->2CO2-
CO2+NaOH----->NaHCO3
2NaHCO3-->Na2CO3+H2O+CO2
Na2CO3+CaCl2-->CaCO3+2NaCl
CaCO3-->CO2+CaO
5)Cl2+H2-->2HCL
2HCl-->Cl2+H2
Cl2+2Na-->2NaCl
2NaCl-->Cl2+2Na
Cl2+2NaOH-->NaClO+NaCl+H2O
a) 4FeS2+11O2\(\overset{t^0}{\rightarrow}\)2Fe2O3+8SO2
2SO2+O2\(\overset{V_2O_5,t^0}{\rightarrow}2SO_3\)
SO3+H2O\(\rightarrow\)H2SO4
Cu+ 2H2SO4đ\(\overset{t^0}{\rightarrow}\)CuSO4+SO2+H2O
b)
AlCl3+3NaOH\(\rightarrow\)Al(OH)3+3NaCl
2Al(OH)3\(\overset{t^0}{\rightarrow}Al_2O_3+3H_2O\)
Al2O3+3H2SO4\(\rightarrow\)Al2(SO4)3+3H2O
Al2(SO4)3+3BaCl2\(\rightarrow\)3BaSO4+2AlCl3
Đánh số trên dãy chuyển hóa nhé!
\(\left(1\right)S+O_2\underrightarrow{t^o}SO_2\\ \left(2\right)SO_2+\frac{1}{2}O_2\underrightarrow{t^o,xt}SO_3\\ \left(3\right)SO_3+H_2O\rightarrow H_2SO_4\\ \left(4\right)H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\\ \left(5\right)Na_2SO_4+BaCl_2\rightarrow2NaCl+BaSO_4\)
\(S+O_2\rightarrow^{t^o}SO_2\)
\(2SO_2+O_2\rightarrow_{V_2O_5}^{t^o}2SO_3\)
SO3 + H2O -> H2SO4
H2SO4 + Na2O -> Na2SO4 + H2O
Na2SO4 + BaCl2 \(\rightarrow BaSO_4\downarrow+2NaCl\)