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yellow. blue. Neutralization of Acids and Bases. Titration Curve of a Neutralisation Reaction. pH of Acid solution starts off very low SA. Base is being added; pH rises. Introduction to Acids & Bases. Definitions. Acids: Eg . HCl (g)  H + ( aq ) + Cl - ( aq ).

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  1. yellow blue

  2. Neutralization of Acids and Bases

  3. Titration Curve of a Neutralisation Reaction pH of Acid solution starts off very low SA Base is being added; pH rises

  4. Introduction to Acids & Bases

  5. Definitions Acids: Eg. HCl(g)  H+(aq) + Cl-(aq) A substance when in solution produces hydronium ions (H3O+); proton DONOR

  6. Acids Bases Bases:

  7. Definitions Bases: Proton ACCEPTOR A substance which contains a hydroxide ion (OH-) or oxide (O2-) A substance when in solution produces hydroxide ions (OH-)

  8. Introduction to Acids & Bases

  9. Acid – Base Reactions Neutralisation Reaction occurs when acids and bases react to form ionic salts ACID + BASE  WATER + SALT HCl(aq) + NaOH(aq)  H2SO4(aq) + K2O (aq)  HBr(aq) + NH3(aq) 

  10. Acid or Base? a) ClO2 ...... ___________ f) CO2 ...... ___________ b) SrO...... ___________ g) Cs2O ... ___________ c) Cr2O3 ... ___________ h) BaO ..... __________ d) SeO2 .... ___________ i) SO3 ...... ___________ e) NO2 ..... ___________ j) Ag2O ..... ___________ What do these molecules all have in common??

  11. Acids Bases Which of those compounds would produce oxide ions??

  12. Basic Oxides • Are “metal” oxides • Eg. Na2O, K2O, MgO, CaO, Fe2O3, Ag2O….. • They all dissociate to produce O2- ions which acts as a STRONG BASE Eg. Step 1: K2O  K+ + O2- Step 2: O2- + H2O  2OH-

  13. Common oxides

  14. Acidic Oxides • “Non-metal” oxides eg. CO2, NO2, P2O3, SO3…. • Remains covalently bonded to oxygen • Chemically combines with water to form an acidic solution eg. SO2 (g) + H2O  H2SO4 Eg. SO2

  15. Acid Rain = non-metal oxides

  16. Amphoteric Oxides Certain metals and metalloid oxides can act as either an acid or a base: Eg. Al2O3+ 6HCl → 2AlCl3 + 3H2O Base Acid Al2O3+ 2NaOH → Na2Al2O4 + H2O Acid Base

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