properties of period 3 oxides

Question 1

what property does aluminium oxide have ?

Answer 1

• it is amphoteric
• so can act as both a base and an acid

Question 2

write the equation for when aluminium oxide acts as a base with HCl

Answer 2

Al2O3 (s) + 6HCl (aq) —> 2AlCl3 (aq) + 3 H2O (l)

Question 3

write the equation for when aluminium oxide acts as an acid with NaOH

Answer 3

Al2O3 (s) + 2 NaOH (aq) —> 2 NaAl(OH)4 (aq) + 3H2O (l)

Question 4

what is formed when basic acids react with an acid ?

Answer 4

• a salt + water