Oxide with H2O

Question 1

Sodium oxide reacts with water?

1. Solubility
2. Observation
3. Equation

Answer 1

1. Soluble
2. Dissolve to give a colourless solution
3. Na2O(s) + H2O(l) -> 2NaOH(aq) is

Question 2

PH of resultant solution of Na2O

Answer 2

13-14; purple

Question 3

Magnesium oxide reacts with water?

1. Solubility
2. Observation
3. Equation

Answer 3

1. Sparingly soluble
2. Does not dissolve
3. MgO (s) + H2O (l) <=> Mg(OH)2 (aq)

Question 4

PH of resultant solutions of MgO

Answer 4

9; blue

Question 5

Aluminium oxide reacts with water?

1. Solubility
2. Observation
3. Equation

Answer 5

1. Insoluble
2. Does not dissolve
3. Ion-dipole interaction

Question 6

Silicon oxide reacts with water?

1. Solubility
2. Observation
3. Explanation

Answer 6

1. Insoluble
2. Does not dissolve
3. Ion-dipole

Question 7

PH of resultant AlO3 and SiO2

Answer 7

7; green

Question 8

Phosphorous pentoxide reacts with water?

1. Solubility
2. Observation
3. Equation

Answer 8

1. Soluble
2. Dissolve to give a colourless solution
3. P4O10(s) + 6H2O(l) -> 4H3PO4
   -P has vacant energetically accessible 3d orbitals for bonding
   => expand its octet structure

Question 9

Sulfur trioxide reacts with water?

1. Solubility
2. Observation
3. Equation

Answer 9

1. Soluble
2. Dissolves to give a colourless solution
3. SO3(l) + H2O(l) -> H2SO4(aq)
   -S has vacant energetically accessible 3d orbitals for bonding
   => expand its octet structures

Question 10

PH of resultant P4O10 and SO3 structures

Answer 10

1-2; red