1 / 9

Water

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

troy-curtis
Download Presentation

Water

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

More Related