Ka value

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Henry Krasner 1C
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

Ka value

Postby Henry Krasner 1C » Tue Feb 12, 2019 5:16 pm

At what value do we consider Ka to be a strong acid?

Lia Inadomi 1I
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: Ka value

Postby Lia Inadomi 1I » Tue Feb 12, 2019 5:18 pm

Really strong acids that dissociate completely do not have a Ka value. However we classify really weak acids with a Ka value of less than 10^(-3)

Laurence Tacderas 1K
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Ka value

Postby Laurence Tacderas 1K » Tue Feb 12, 2019 6:06 pm

Since strong acids fully disassociate, just know that they won't even have a Ka value because there's no reactants at the end of the reaction. If Ka=[P]/[R] and there's no R, then you won't have to worry about Ka for strong acids, only weak acids.

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

Re: Ka value

Postby Max Hayama 4K » Tue Feb 12, 2019 6:52 pm

You should only be worried about what Ka value is associated with a weak acid, since this will determine whether or not you can make assumptions. However for the midterm, Dr. Lavelle said there would be no questions in which you can make the assumption that x is essentially insignificant.

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