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Annalyn Diaz 1J
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Joined: Fri Sep 28, 2018 12:15 am


Postby Annalyn Diaz 1J » Wed Dec 05, 2018 10:50 am

I’ve seen that Kw=Ka*Kb, but I’ve also seen Kw=10^-14. Can someone clarify that concept for me? Thanks.

Hovik Mike Mkryan 2I
Posts: 95
Joined: Fri Sep 28, 2018 12:25 am

Re: Kw

Postby Hovik Mike Mkryan 2I » Wed Dec 05, 2018 12:39 pm

Kw is representing the concentration of both the hydroxide and hydronium concentrations. Kw= 1.0 x 10^-7 multiplied with another 1.0 x 10^-7. Each 1.0 x 10^-7 represents the concentration for both hydroxide and hydronium. Therefore, kw can equal to both of the answers you stated. Hope this helped!

Steven Garcia 1H
Posts: 79
Joined: Fri Sep 28, 2018 12:16 am

Re: Kw

Postby Steven Garcia 1H » Wed Dec 05, 2018 1:38 pm

Kw is simply a constant that helps when calculating the pH. Kw has a value of 1.0x10^-14.
You can also express Kw in the equation Kw=Ka*kb. This equation just goes to show that the product of the concentration of H3O+ ions (Ka) and the concentration of OH- ions (Kb) should always equal in 1.0x10^-14.

Say you know the concentration of H3O+ ions, but not the concentration of OH- ions, you can plug in the known values and solve for the concentration of OH- ions (Kb). Hope this helps!

Pooja Sheladiya 1L
Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

Re: Kw

Postby Pooja Sheladiya 1L » Wed Dec 05, 2018 1:42 pm

Is Pka different from kw?

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