## Value of Kw?

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

Emily Vainberg 1D
Posts: 102
Joined: Sat Jul 20, 2019 12:15 am

### Value of Kw?

Is the value for Kw always 1x10^14? In the textbook that is the value they used for the example but I'm not sure if that is always the value.

SarahSteffen_LEC4
Posts: 67
Joined: Sat Aug 24, 2019 12:17 am

### Re: Value of Kw?

Yes, this is the value that is always used because it is a constant.

Sebastian Lee 1L
Posts: 157
Joined: Fri Aug 09, 2019 12:15 am
Been upvoted: 1 time

### Re: Value of Kw?

For the calculations we will be doing in 14A, this is the value for Kw. All this means is that in water at standard temperature and pressure, the concentration of hydronium ions [H3O+] times the concentration of hydroxide ions [OH-] is 1 x 10-14. This tells us that pH + pOH is 14. However, the value of Kw can change if the temperature changes: at high temps, it increases so water is more acidic; at low temps, it decreases so water is more basic.

605208780
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

### Re: Value of Kw?

Yes. This is the constant value that should always be used.

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

### Re: Value of Kw?

I don't remember learning this, will it be on the final?