1 / 20

Acids Lesson 14 Amphiprotic Ions Acids or Bases?

Acids Lesson 14 Amphiprotic Ions Acids or Bases?. Amphiprotic Ions H 3 PO 4 Acid H 2 PO 4 - Amphiprotic HPO 4 2- Amphiprotic PO 4 3- Base Amphiprotic ions have a Ka and a Kb . If the Ka > Kb , then the ion is an acid . If the Kb > Ka , then the ion is a base.

nasya
Download Presentation

Acids Lesson 14 Amphiprotic Ions Acids or Bases?

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. Acids Lesson 14 Amphiprotic Ions Acids or Bases?

  2. Amphiprotic Ions H3PO4Acid H2PO4-Amphiprotic HPO42-Amphiprotic PO43-Base Amphiprotic ionshave a Ka and a Kb. If the Ka > Kb, then the ion is an acid. If the Kb > Ka, then the ion is a base.

  3. Is H2PO4- acid or basic acid

  4. 1. Is H2PO4- an acid or base when in water? Write the predominate hydrolysis equation for this ion. Ka (H2PO4-) = 6.2 x 10-8 Kb (H2PO4-)=Kw Ka(H3PO4) =1 x 10-14 7.5 x 10-3 =1.3 x 10-12 Ka > Kb Acid H2PO4- + H2O ⇄HPO42- + H3O+

  5. Is HPO42- acid or basic basic

  6. 2. Is HPO42- an acid or base when in water? Write the hydrolysis equation for this ion. Ka (HPO42-) = 2.2 x 10-13 Kb (HPO42-)= Kw Ka(H2PO4-) =1 x 10-14 6.2 x 10-8 =1.6 x 10-7 Kb > Ka base HPO42- + H2O ⇄H2PO4- + OH-

  7. 3. Show by calculation if NH4F is an acid or base when in water. NH4F → NH4+ + F- acid base Both have weak parents- neither will cross off! What will the salt be? Ka(NH4+) = 5.6 x 10-10 Kb (F-) = = Kw Ka(HF) = 1 x 10-14 3.5 x 10-4 =2.9 x 10-11 Ka > Kbacid

  8. 4. Show by calculation if NH4CH3COO is an acid or base when in water. NH4CH3COO → NH4+ + CH3COO- acid base Ka(NH4+) = 5.6 x 10-10 Kb (CH3COO-) = = Kw Ka(CH3COOH) = 1 x 10-14 1.8 x 10-5 =5.6 x 10-10 Ka = Kbneutral pH = 7.00

  9. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3 +2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M

  10. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3 +2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M 0.0250 L KOH

  11. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3 +2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M 0.0250 L KOH x 0.200 mol L

  12. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3 +2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M 0.0250 L KOH x 0.200 mol x 1 mole H2CO3 L 2 mole KOH

  13. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3 +2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M 0.0250 L KOH x 0.200 mol x 1 mole H2CO3 x 1 L L 2 mole KOH 0.100 mol

  14. 5. Calculate the volume of 0.100 M H2CO3 required to neutralize 25.0 mL of 0.200 M KOH. 1H2CO3+2KOH → K2CO3 + 2HOH ? L 0.0250 L 0.100 M 0.200 M 0.0250 L KOH x 0.200 mol x 1 mole H2CO3 x 1 L= 0.0250 L L 2 mole KOH 0.100 mol

  15. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Mg(OH)2(s)⇌ Mg2+ + 2OH- CN- + H2O ⇌ HCN + OH- NH4+ + H2O ⇌ H3O+ + NH3   N2O4(g)⇌ 2NO2(g) 2H2O ⇌ H3O+ + OH-

  16. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Ksp Mg(OH)2(s)⇌ Mg2+ + 2OH- CN- + H2O ⇌ HCN + OH- NH4+ + H2O ⇌ H3O+ + NH3   N2O4(g)⇌ 2NO2(g) 2H2O ⇌ H3O+ + OH-

  17. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Ksp Mg(OH)2(s)⇌ Mg2+ + 2OH- Kb CN- + H2O ⇌ HCN + OH- NH4+ + H2O ⇌ H3O+ + NH3   N2O4(g)⇌ 2NO2(g) 2H2O ⇌ H3O+ + OH-

  18. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Ksp Mg(OH)2(s)⇌ Mg2+ + 2OH- Kb CN- + H2O ⇌ HCN + OH- Ka NH4+ + H2O ⇌ H3O+ + NH3   N2O4(g)⇌ 2NO2(g) 2H2O ⇌ H3O+ + OH-

  19. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Ksp Mg(OH)2(s)⇌ Mg2+ + 2OH- Kb CN- + H2O ⇌ HCN + OH- Ka NH4+ + H2O ⇌ H3O+ + NH3 Keq N2O4(g)⇌ 2NO2(g) 2H2O ⇌ H3O+ + OH-

  20. 6. Label the equation that has a Ka, Kb, Ksp, Kw, or Keq. Ksp Mg(OH)2(s)⇌ Mg2+ + 2OH- Kb CN- + H2O ⇌ HCN + OH- Ka NH4+ + H2O ⇌ H3O+ + NH3 Keq N2O4(g)⇌ 2NO2(g) Kw 2H2O ⇌ H3O+ + OH-

More Related