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JAČINA KISELINA I BAZA
MONOPROTONSKA KISELINA
    HA + H2O ↔ A- + H3O+

     K1    B2     B1     K2

 Primenom ZDM
         [H3O+][ A-]
    Kc = -------------
         [H2O] [HA]
     Kc*[H2O] = Ka
                 [H3O+][ A-]
          Ka = -------------        - konstanta protolize kiseline
                               [HA]            (kiselinska konstanta)
JAČINA KISELINA

 HClO4 > HClO3 > HClO


 HClO4 > H2SO4 > HNO3 > H3PO4 > H2CO3 > H3BO3,
  H4SiO4 > H3AlO3 = Al(OH)3
Podela kiselina po jačini
 Vrlo slabe   Ka ≤ 10-7 mol/dm3 (H2S, HCN, H3BO3)


 Slabe        10-7 ≤ Ka ≤ 10-2 mol/dm3 ( CH3COOH, H2CO3, H3PO4)


 Jake         10-2 ≤ Ka ≤ 103 mol/dm3 (HCl, H2SO4)


 Vrlo jake    Ka > 103 mol/dm3 (HClO4)
PROTOLIZA BAZE

    B + H2O ↔ BH+ + OH-
     B1   K2      K1    B2


          [BH+][ OH-]
    Kb = -----------------   - konstanta protolize baze
             [B]                (bazna konstanta)
JAČINA BAZA

 Slabe: NH3, Mg(OH)2

 Jake: NaOH, KOH, Ba(OH)2, Ca(OH)2, Sr(OH)2
Proizvod konstanti

 Ka * Kb = [H3O+][ OH-] = Kw
 logaritmovanjem
        pKa + pKb = 14

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Hemija r1 kiseline_i_baze_jacina_kiselina_i_baza

  • 2. MONOPROTONSKA KISELINA  HA + H2O ↔ A- + H3O+ K1 B2 B1 K2  Primenom ZDM [H3O+][ A-] Kc = ------------- [H2O] [HA] Kc*[H2O] = Ka [H3O+][ A-] Ka = ------------- - konstanta protolize kiseline [HA] (kiselinska konstanta)
  • 3. JAČINA KISELINA  HClO4 > HClO3 > HClO  HClO4 > H2SO4 > HNO3 > H3PO4 > H2CO3 > H3BO3, H4SiO4 > H3AlO3 = Al(OH)3
  • 4. Podela kiselina po jačini  Vrlo slabe Ka ≤ 10-7 mol/dm3 (H2S, HCN, H3BO3)  Slabe 10-7 ≤ Ka ≤ 10-2 mol/dm3 ( CH3COOH, H2CO3, H3PO4)  Jake 10-2 ≤ Ka ≤ 103 mol/dm3 (HCl, H2SO4)  Vrlo jake Ka > 103 mol/dm3 (HClO4)
  • 5. PROTOLIZA BAZE  B + H2O ↔ BH+ + OH- B1 K2 K1 B2  [BH+][ OH-] Kb = ----------------- - konstanta protolize baze [B] (bazna konstanta)
  • 6. JAČINA BAZA  Slabe: NH3, Mg(OH)2  Jake: NaOH, KOH, Ba(OH)2, Ca(OH)2, Sr(OH)2
  • 7. Proizvod konstanti  Ka * Kb = [H3O+][ OH-] = Kw  logaritmovanjem pKa + pKb = 14