Metal Oxide and Metal Hydroxide Flashcards
What is Alumina?
aluminium oxide
What property does alumina contain?
Its amphoteric
What does amphoteric mean?
It will act as a base or acid
Alumina is dropped in a hot acid / base. What will happen to the Alumina?
Alumina is chemically inert except when placed in a hot base or acid.
Why is Alumina used as a medium in chromatography?
It has an amphoteric nature and can be used as a basic, acidic or neutral medium
Alumina is an effective desiccant, its stable over pH 2-13. How is this helpful?
makes it more suitable for environmental clean-up and separation applications
What happens when Group 1 and 2 metals are dropped into water?
the metals react with the water forming metal hydroxides forming an alkali solution
Why does the oxide ion have a strong basic anion?
it has a small size and a high charge of -2
What happens to the oxide ions in metal oxides when reacting with water and why?
oxide ions in metal ions react with water to produce hydroxide ions because its the strongest base that can persist in water
why is calcium hydroxide recommended from other bases?
cheap, easy to use, its a base which forms calcium sulphate
explain why magnesium used as a desiccant to preserve books?
the magnesium oxide can neutralise the acidic sulphur oxides that papers produce.
why is magnesium hydroxide tablets taken for patients and explain what happens if a patient takes magnesium hydroxide tablets?
its to treat stomach indigestion and it raises the stomach pH due to its basic nature
why is sodium hydroxide used to peel fruits / process foods / in drain or oven cleaners?
has the basic nature properties of the compound.
explain why calcium hydroxide is environmental friendly.
factories may produce acidic liquid and calcium hydroxide is a lime, therefore it lowers the pH of the acidic liquid.
