unit 5 chem

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6 Terms

1
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Acid

Dissociated in water to form H+ ions

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Base

Reacts with acids to form salt and water

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Alkali

A base that dissolves in water to form OH- ions ( all alkalis are bases but not all bases are alkali )

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Amphoteric

A Substance that can act as both an acid and base

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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

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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