## Kw

AGaeta_2C
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Joined: Wed Sep 18, 2019 12:21 am

### Kw

Is Kw the equilibrium constant for water or the ionization constant?

cassidysong 1K
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Joined: Fri Aug 30, 2019 12:15 am

### Re: Kw

Kw is the equilibrium constant.

Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

### Re: Kw

Both, as they refer to the same thing.

Kate Swertfager
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Joined: Wed Sep 18, 2019 12:17 am

### Re: Kw

Equilibrium constant and ionization constant of water are the same thing in this case.

Jaci Glassick 2G
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Joined: Sat Jul 20, 2019 12:16 am

### Re: Kw

Both. They are the same thing.

Jasmine Vallarta 2L
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Joined: Sat Aug 17, 2019 12:18 am

### Re: Kw

Kw = 1.0 x 10^-14

Caroline Beecher 2H
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Joined: Wed Nov 14, 2018 12:21 am

### Re: Kw

Kw refers to the equilibrium constant for water and/or the ionization constant. Also as Dr. Lavelle discussed further today in class, for acids you can call it the acidity, ionization, or dissociation constant.

405318478
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Joined: Sat Jul 20, 2019 12:16 am

### Re: Kw

In lecture Lavelle said that Kw is a constant, 1.0 x 10^-14. I'm looking at a homework problem, and it gives kw as 2.1 x 10^-14, could someone clarify the meaning of the value of Kw? The homework question im referring to is 6A.21

Posts: 102
Joined: Wed Sep 18, 2019 12:21 am

### Re: Kw

Kw is a constant and I believe and it is the equilibrium constant for water and it equals 1.0x10^-14.

Zoe Gleason 4F
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Joined: Tue Jul 23, 2019 12:15 am

### Re: Kw

405318478 wrote:In lecture Lavelle said that Kw is a constant, 1.0 x 10^-14. I'm looking at a homework problem, and it gives kw as 2.1 x 10^-14, could someone clarify the meaning of the value of Kw? The homework question im referring to is 6A.21

In that problem, the Kw is different because it was found at a different temperature. The value from Kw in class is at 25C. A change in temperature will result in a change of K.

Jasmine Fendi 1D
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Joined: Sat Aug 24, 2019 12:15 am

### Re: Kw

They are the same thing, and Kw=Ka*Kb=10^-14

504939134
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

### Re: Kw

They both essentially mean the same thing, and you can use them interchangeably.

Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

### Re: Kw

Kw is the equilibrium constant for water.

Omar Selim 1D
Posts: 108
Joined: Sat Jul 20, 2019 12:16 am

### Re: Kw

Kw = 1.0 *10^-14 is the equilibrium constant for water, which is also defined as Kw = Ka * Kb. The two definitions you gave are interchangeable for the most part

Nathan Rothschild_2D
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Joined: Fri Aug 02, 2019 12:15 am

### Re: Kw

Kw is the equilibrium constant for water and at 25 C is 10^(-14), but if the equation doesn't specify the temperature, can we assume that the reaction is taking place at 25 C?

705121606
Posts: 68
Joined: Wed Sep 18, 2019 12:17 am

### Re: Kw

They are the same value, just keep in mind that this value changes at different given temperatures. The one we use most often is 1.0 x10-14 at 25C.

705121606
Posts: 68
Joined: Wed Sep 18, 2019 12:17 am

### Re: Kw

Nathan Rothschild_2D wrote:Kw is the equilibrium constant for water and at 25 C is 10^(-14), but if the equation doesn't specify the temperature, can we assume that the reaction is taking place at 25 C?

I believe so, if it was at a different temperature, that temperature would have to be specified.

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