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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


  • 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


  • 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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