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Water. Water can behave as an acid or a base. Water contains H + and OH - ions. Water dissociates: H 2 O (l)  H + (aq) + OH - (aq) Really H 3 O + hydronium ion. Amphiprotic vs amphoteric. A substance that can donate or accept protons is called amphiprotic

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water
Water
  • Water can behave as an acid or a base.
  • Water contains H+ and OH- ions.
  • Water dissociates:
  • H2O(l) H+(aq) + OH-(aq)
  • Really H3O+ hydronium ion

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

amphiprotic vs amphoteric
Amphiprotic vs amphoteric
  • A substance that can donate or accept protons is called amphiprotic
  • Salts can act as acids and bases by donating or accepting H+- usually H3O+ or OH- ions are formed – this is called amphoteric

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

slide3
acid base
  • HCl + H2O  H3O+ + Cl-
  • Wateris behaving as a base

accepts proton

donates proton

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

slide4
base acid
  • O2- + H2O  OH-
  • Wateris behaving as an acid

accepts proton

donates proton

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

amphiprotic
Amphiprotic
  • Water is amphiprotic as it does not react with acids or bases to neutralise them – it does however donate or accept protons.
  • An amphoteric substance can neutralise an acid or a base

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

acidic substances
Acidic substances
  • When [H3O+] > [OH-] a solution is acidic
  • An acidic substance is a substance that will either:
  • dissolve in water to form an acidic solution OR
  • Do not dissolve but react with bases and basic solutions

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

basic substances
Basic substances
  • When [OH-]> [H3O+] a solution is basic
  • A basic substance is a substance that will either:
  • dissolve in water to form a basic solution OR
  • Do not dissolve but react with acids and acidic solutions

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

amphoteric substances
Amphoteric substances
  • Amphoteric substances do not dissolve in waterBUTdo react with BOTHacidic and basic solutions.
  • Metal oxides and hydroxides are amphoteric

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

al 2 o 3 is amphoteric
Al2O3 is amphoteric
  • Al2O3(s)+6H+(aq)2Al3+(aq) +3H2O(aq)
  • Al2O3(s)+2OH-(aq)+3H2O 2Al(OH)4(aq) +3H2O(aq)
  • evaporated  NaAl(OH)4
  • Al2O3(s) has reacted with both an acidic solution and a basic solution

12 Chemistry 2.6 rxn rates, eqm, acids and bases CR 07

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