Question

Cho các chất : Mg(OH)2 , CaCO3 , K2SO4 , HNO3 , CuO , NaOH , P2O5 . Chất nào tác dụng được với
a) dung dịch HCl
b) dung dịch Ba(OH)2
c) dung dịch BaCl2
d) Viết các PTHH xảy ra

Answer 1

a) dd HCl : Mg(OH)2,CaCO3,CuO,NaOH

2HCl + Mg(OH)2 ------> MgCl2 + 2H2O

2HCl + CaCO3 ----> CaCl2 + H2O + CO2

2HCl + CuO ------> CuCl2 + H2O

HCl + NaOH ------> NaCl + H2O

b) dd Ba(OH)2 : K2SO4,HNO3,P2O5

Ba(OH)2 + K2SO4 -----> BaSO4 + 2KOH

Ba(OH)2 + H2NO3 -------> Ba(NO3)2 + 2H2O

3Ba(OH)2 + P2O5 -----> Ba3(PO4)2 +3H2O

c) dd BaCl2 : K2SO4

BaCl2 + K2SO4 -----> BaSO4 + 2KCl

Answer 2

a) 1. 2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O

2. 2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂↑

3. 2HCl + CuO → CuCl₂ + H₂O

4. HCl + NaOH → NaCl + H₂O

Answer 3

b) 1. Ba(OH)₂ + CaCO₃ → Ca(OH)₂ + BaCO₃↓

2. Ba(OH)₂ + K₂SO₄ → BaSO₄↓ + 2KOH

3. Ba(OH)₂ + 2HNO₃ → Ba(NO₃)₂ + 2H₂O

4. 3Ba(OH)₂ + P₂O₅ → Ba₃(PO₄)₂ + 3H₂O

Answer 4

c) 1. BaCl₂ + CaCO₃ → CaCl₂ + BaCO₃↓

2. BaCl₂ + K₂SO₄ → 2KCl + BaSO₄↓

Answer 5

a/

Mg(OH)₂+ 2HCl\(\rightarrow\) MgCl₂+ 2H₂O

CaCO₃+ 2HCl\(\rightarrow\) CaCl₂+ CO₂\(\uparrow\)+ H₂O

NaOH+ HCl\(\rightarrow\) NaCl+ H₂O

b/

K₂SO₄+ Ba(OH)₂\(\rightarrow\) 2KOH+ BaSO₄\(\downarrow\)

Ba(OH)₂+ 2HNO₃\(\rightarrow\) Ba(NO₃)₂+ 2H₂O

3Ba(OH)₂+ P₂O₅\(\rightarrow\) Ba₃(PO₄)₂\(\downarrow\)+ 3H₂O

c/

BaCl₂+ K₂SO₄\(\rightarrow\) 2KCl+ BaSO₄\(\downarrow\)