Properties of oxides and hydroxides

—> aluminium oxide

—> amphoteric : a substance that can act as both an acid and base.

—> behaves as other bases when reacted with HOT acids (won’t react otherwise).

—> aluminium oxide with acid
AI2O3 + 6HCI -> 2AICI3 + 3H2O

—> aluminium oxide with base
AI2O3 + 2NaOH + 3H2O -> 2AI (OH) (hot sodium hydroxide)

—> reacts with bases to form aluminates.

—> other aluminates can form depending on the conditions.

—> hot concentrated NaOH will give Sodium tetrahydroxoaluminate

—> inert (except if hot acid/base) / chemically stable

• paint
• sunscreen
• glass

—> amphoteric nature

• medium for chromatograph as acid/base/neutral
• desiccant (stable pH 2-13)
• environment clean up and separation applications

—> high melting and boiling point (strong)

• a lot of energy needed to burn
• combusts at high temperature
• does not decompose

—> thermal and electrical conductivity

—> lightweight

—> medical - prosthetics and implants.

• inert - will not react with body/corrode.
• lightweight

—> military and protective equipment- armour

• lightweight
• strong

—> furnace

• high melting and boiling point

—> filter for plastic and bricks

• inert
  strong