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TOPIC: WATER, the neutral substance Do Now. Water self-ionizes. H 2 O(l) + H 2 O(l)  H 3 O +1 ( aq ) + OH -1 ( aq ) H 3 O +1 = hydronium ion OH -1 = hydroxide ion H +1 and H 3 O +1 used interchangeably H +1 called proton or hydrogen ion. Acid, Base, or Neutral .

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Water self ionizes
Water self-ionizes

  • H2O(l) + H2O(l)  H3O+1(aq) + OH-1(aq)

    H3O+1 = hydronium ion

    OH-1 = hydroxide ion

  • H+1 and H3O+1 used interchangeably

    H+1 called proton or hydrogen ion


Acid base or neutral
Acid, Base, or Neutral

  • all H2O contains some H+1 & some OH-1 ions

    • pure H2O: concentrations verylow (like 10-7)

  • Neutral solution: [H+1] = [OH-1]

  • Acidic solution: H+1 > OH-1

  • Basic solution: OH-1 > H+



Now let s review salts
Now let’s review salts

  • Ionic Compounds (metal + nonmetal)

  • Structure = Crystal lattice = solid

  • Can ionize in water

    • NaCl(s)  Na+1(aq) + Cl-1(aq)

    • CaBr2(s)  Ca+2(aq) + 2Br-1(aq)

    • Al(NO3)3(s)  Al+3(aq) + 3NO3-1(aq)

  • Can be formed when acids and bases react

  • Can be formed when an acid and metal react

H2O

H2O

H2O


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