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

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Presentation transcript:

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

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

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw1.0 x

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]1.0 x M

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]>1.0 x M

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]>1.0 x MpH 7

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]>1.0 x MpH <7

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

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

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]>1.0 x MpH <7 [OH - ]>1.0 x M pOH 7

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Higher o Cshifts rightKw>1.0 x [H + ]>1.0 x MpH <7 [OH - ]>1.0 x M pOH <7

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

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

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

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o CKw1.0 x

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw1.0 x

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ]1.0 x M

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ]<1.0 x M

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ]<1.0 x MpH 7

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ] 7

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ] 7 [OH - ]1.0 x M

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ] 7 [OH - ]<1.0 x M

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

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ] 7 [OH - ] 7

Kw and Temperature Energy+H 2 O ⇋ H + +OH o CKw=1.0 x Lower o Cshifts leftKw<1.0 x [H + ] 7 [OH - ] this temperature pH+ pOH

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

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

Important Points If you're 25 o C [H + ][OH - ] ≠1.0 x pH+POH ≠14 All other equations are valid and……. Pure water is always neutral, but pH ≠ 7 and……. [H + ] = [OH - ] and …… pH = pOH

1.The pH of pure water is 6.50 Is the temperature higher or lower than 25 o C? Calculate the Kw. [H + ] = = x M Energy+H 2 O ⇋ H + +OH - Higher [OH - ]= x M Kw=[H + ][OH - ]=( x ) 2 Kw=1.0 x

2.The Kw = 5.0 x 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 shifted right…… temperature is higher Kw = 5.0 x = [H + ][OH - ] = x 2 x=[H + ]=7.071 x M pH=pOH=6.15