Question

Những chất nào sau đây: CaCO_3, Al₂O_3, SO_3, Fe₂O_3, CO_2, NaCl, Cu, Na, CO, Na₂O. Chất nào tan trong nước? Chất nào tan trong dung dịch KOH? Viết PTHH?

Answer 1

- H2O :SO3, CO2, NaCl,Na, Na2O.

SO3 + H2O --> H2SO4

CO2 + H2O <--> H2CO3

NaCl

Na + H2O --> NaOH + 1/2H2

Na2O + H2O --> 2NaOH

- KOH : Al2O3, SO3, CO2, NaCl, Na, Na2O.

2KOH + Al2O3 --> 2KAlO2 + H2O

2KOH + CO2 --> K2CO3 + H2O

KOH + CO2 --> KHCO3

2KOH + SO3 --> K2SO4 + H2O

Na + H2O --> NaOH + 1/2H2

Na2O + H2O --> 2NaOH

Answer 2

Tan trong nước: SO3,CO2,NaCl,Na,Na2O

SO3+H2O--->H2SO4

CO2+H2O--->H2CO3

2Na+2H2O---->2NaOH+H2

Na2O+H2O-->2NaOH

tan trong KOH:Al2O3,,CO2, SO3

Al2O3+2KOH----> K2AlO2+H2O

CO2+2KOH--->K2CO3+H2O

2KOH+SO3---->K2SO4+H2O

Answer 3

https://i.imgur.com/uKYubkp.jpg

Answer 4

\(\cdot\cdot\text{Tan trong H2O}\)

\(Al2O3+H2O\rightarrow2Al\left(OH\right)3\)

\(SO3+H2O\rightarrow H2SO4\)

\(\text{Fe2O3 + 3H2O = 2Fe(OH)3}\)

\(CO2+H2O\rightarrow H2CO3\)

\(NaCl+2H2O\rightarrow Cl2+H2+2NaOH\)

\(2Na+2H2O\rightarrow2NaOH+H2\)

\(CO+H2O\rightarrow CO2+H2\)

\(Na2O+H2O\rightarrow2NaOH\)

\(\cdot\cdot\text{Tan trong KOH}\)

\(\text{CaCO3 + 2KOH = Ca(OH)2 + K2CO3}\)

\(Al2O3+2KOH\rightarrow\text{H2O + 2KAlO2}\)

\(SO3+2KOH\rightarrow\text{ H2O + K2SO4 }\)

\(\text{Fe2O3 + 6KOH = 2Fe(OH)3 + 3K2O}\)

\(CO2+2KOH\rightarrow\text{H2O + K2CO3}\)

\(\text{NaCl + KOH → NaOH + KCl}\)

\(\text{CO + KOH | HCOOK}\)

\(\text{Na2O + 2KOH = 2NaOH + K2O}\)