unit 5 chem
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6 Terms
Acid
Dissociated in water to form H+ ions
Base
Reacts with acids to form salt and water
Alkali
A base that dissolves in water to form OH- ions ( all alkalis are bases but not all bases are alkali )
Amphoteric
A Substance that can act as both an acid and base
What is aluminium oxide (alumina)
Alumina (Al₂O₃) Al³+ and O²-
Its chemically inert (unreactive “) except in certain conditions Such as hot acid or base
Given that its amphoteric since it reacts with acids and bases
Example of alumina reacting with acid (hot hydrochloric acid) : Al₂O₃ 6H+ → 2Al³+ + 3H₂O
Example of alumina reacting with base ( hot hydroxide): Al₂O₃ + 2NaOH + 3H₂O —> 3NaAl(OH)₄
Alumina uses
it being chemically inert (interactive) makes it very useful
Its used in fillers pains suncreeens and glass
Used as a stain part phase in chromatography
An effective desiccant ( an effective drying agent) used in things like shoes to make sure moisture is removed tho alumina isn’t used in those cases but shoes what it does
Note 
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