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Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x 10 -14 Higher o CKw1.0 x 10 -14.

Published byBarbra Barker Modified over 9 years ago

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Presentation on theme: "Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x 10 -14 Higher o CKw1.0 x 10 -14."— Presentation transcript:

1 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o CKw1.0 x 10 -14

2 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o CKw1.0 x 10 -14

3 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw1.0 x 10 -14

4 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14

5 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]1.0 x 10 -7 M

6 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 M

7 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH 7

8 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7

9 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]1.0 x 10 -7 M

10 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M

11 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M pOH 7

12 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M pOH <7

13 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M pOH <7 @ this temperature pH+ pOH

14 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M pOH <7 @ this temperature pH+ pOH≠ 14

15 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Higher Temperatures @50 o Cshifts rightKw>1.0 x 10 -14 [H + ]>1.0 x 10 -7 MpH <7 [OH - ]>1.0 x 10 -7 M pOH <7 @ this temperature pH+ pOH≠ 14 = pKw

16 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o CKw1.0 x 10 -14

17 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw1.0 x 10 -14

18 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14

19 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ]1.0 x 10 -7 M

20 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ]<1.0 x 10 -7 M

21 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ]<1.0 x 10 -7 MpH 7

22 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7

23 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ]1.0 x 10 -7 M

24 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ]<1.0 x 10 -7 M

25 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ]<1.0 x 10 -7 M pOH 7

26 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ] 7

27 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ] 7 @ this temperature pH+ pOH

28 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ] 7 @ this temperature pH+ pOH≠ 14

29 Kw and Temperature Energy+H 2 O ⇋ H + +OH - @25 o CKw=1.0 x 10 -14 Lower Temperatures @0 o Cshifts leftKw<1.0 x 10 -14 [H + ] 7 [OH - ] 7 @ this temperature pH+ pOH≠ 14 = pKw

30 Important Points If you're not @ 25 o C [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 1.The pH of pure water is 6.50 Is the temperature higher or lower than 25 o C? Calculate the Kw. [H + ] = 10 -6.50 =3.1623 x 10 -7 M Energy+H 2 O ⇋ 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 o C? Calculate the pH and pOH. Energy + H 2 O ⇋ H + +OH - Kw > 1.0 x 10 -14 shifted right…… temperature is higher Kw = 5.0 x 10 -13 = [H + ][OH - ] = x 2 x=[H + ]=7.071 x 10 -7 M pH=pOH=6.15

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