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Kw and Temperature Energy + H 2 O ⇋ H + + OH - @ 25 o C Kw = 1.0 x 10 -14 Higher Temperatures @ 50 o C Kw

Kw and Temperature Energy + H 2 O ⇋ H + + OH - @ 25 o C Kw = 1.0 x 10 -14 Higher Temperatures @ 50 o C Kw 1.0 x 10 -14. Kw and Temperature Energy + H 2 O ⇋ H + + OH - @ 25 o C Kw = 1.0 x 10 -14 Higher Temperatures @ 50 o C Kw 1.0 x 10 -14.

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Kw and Temperature Energy + H 2 O ⇋ H + + OH - @ 25 o C Kw = 1.0 x 10 -14 Higher Temperatures @ 50 o C Kw

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  1. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oC Kw 1.0 x 10-14

  2. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oC Kw 1.0 x 10-14

  3. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw 1.0 x 10-14

  4. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14

  5. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] 1.0 x 10-7 M  

  6. Kw and Temperature • Energy + H2O ⇋ H+ + OH- • @ 25 oC Kw = 1.0 x 10-14 • Higher Temperatures • @ 50 oCshifts right Kw > 1.0 x 10-14 • [H+] > 1.0 x 10-7 M  

  7. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH 7

  8. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7

  9. Kw and Temperature • Energy + H2O ⇋ H+ + OH- • @ 25 oC Kw = 1.0 x 10-14 • Higher Temperatures • @ 50 oCshifts right Kw > 1.0 x 10-14 • [H+] > 1.0 x 10-7 M pH < 7 • [OH-] 1.0 x 10-7 M  

  10. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M  

  11. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M pOH 7

  12. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M pOH < 7

  13. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M pOH < 7 @ this temperature pH + pOH

  14. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M pOH < 7 @ this temperature pH + pOH ≠ 14

  15. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Higher Temperatures @ 50 oCshifts right Kw > 1.0 x 10-14 [H+] > 1.0 x 10-7 M pH < 7 [OH-] > 1.0 x 10-7 M pOH < 7 @ this temperature pH + pOH ≠ 14 = pKw

  16. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oC Kw 1.0 x 10-14

  17. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw 1.0 x 10-14

  18. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14

  19. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] 1.0 x 10-7 M  

  20. Kw and Temperature • Energy + H2O ⇋ H+ + OH- • @ 25 oC Kw = 1.0 x 10-14 • Lower Temperatures • @ 0 oCshifts left Kw < 1.0 x 10-14 • [H+] < 1.0 x 10-7 M  

  21. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH 7

  22. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7

  23. Kw and Temperature • Energy + H2O ⇋ H+ + OH- • @ 25 oC Kw = 1.0 x 10-14 • Lower Temperatures • @ 0 oCshifts left Kw < 1.0 x 10-14 • [H+] < 1.0 x 10-7 M pH > 7 • [OH-] 1.0 x 10-7 M  

  24. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M  

  25. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M pOH 7

  26. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M pOH > 7

  27. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M pOH > 7 @ this temperature pH + pOH

  28. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M pOH > 7 @ this temperature pH + pOH ≠ 14

  29. Kw and Temperature Energy + H2O ⇋ H+ + OH- @ 25 oC Kw = 1.0 x 10-14 Lower Temperatures @ 0 oCshifts left Kw < 1.0 x 10-14 [H+] < 1.0 x 10-7 M pH > 7 [OH-] < 1.0 x 10-7 M pOH > 7 @ this temperature pH + pOH ≠ 14 = pKw

  30. Important Points If you're not @ 25oC [H+][OH-] ≠ 1.0 x 10-14 pH + POH ≠ 14 All other equations are valid and……. Pure water is always neutral, but pH ≠ 7 and……. [H+] = [OH-] and …… pH = pOH

  31. The pH of pure water is 6.50 • Is the temperature higher or lower than 25 oC? • Calculate the Kw. • [H+] =10-6.50 = 3.1623 x 10-7 M • Energy + H2O ⇋ H+ + OH- • Higher • [OH-] =3.1623 x 10-7 M • Kw = [H+][OH-] =(3.1623 x 10-7)2 • Kw = 1.0 x 10-13

  32. 2.The Kw = 5.0 x 10-13 for pure water. Is the temperature higher or lower than 25 oC? Calculate the pH and pOH. Energy + H2O ⇋ H+ + OH- Kw > 1.0 x 10-14 shifted right…… temperature is higher Kw = 5.0 x 10-13 = [H+][OH-] = x2 x = [H+] = 7.071 x 10-7 M pH = pOH = 6.15

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