Kb vs Ka

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Kb vs Ka

Postby 305385703 » Sat Jan 18, 2020 5:47 pm

I understand how in lecture Mr Lavelle told us that the Kb of a weak acid was Kw over the Ka. But does this represent the Kb of that same compound, or the Kb of its conjugate base? For example, would the Kb calculated from the Ka of HSO4 be the Ka of HSO4 or the Ka of H2SO4?

Wilson 2E
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Re: Kb vs Ka

Postby Wilson 2E » Sat Jan 18, 2020 5:50 pm

If I understood correctly, I believe that it is the Kb/Ka for the conjugate reaction, whichever produces either OH or H3O, respectively

Skyllar Kuppinger 1F
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Re: Kb vs Ka

Postby Skyllar Kuppinger 1F » Sat Jan 18, 2020 8:56 pm

When you’re given Kb of a base and you calculate for Ka, then that Ka is of the conjugate acid of that base. Similarly , if you’re given the Ka of an acid and calculate Kb, then that Kb is for the conjugate base of that acid. Hope this helps !

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Re: Kb vs Ka

Postby 205405339 » Sat Jan 18, 2020 9:48 pm

Kb is for weak base reactions and Ka is for weak acid reactions

Emily Lo 1J
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Re: Kb vs Ka

Postby Emily Lo 1J » Sun Jan 19, 2020 4:13 pm

Kb is for bases while Ka is for acids.

Timmy Nguyen Dis 1I
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Joined: Sat Aug 17, 2019 12:17 am

Re: Kb vs Ka

Postby Timmy Nguyen Dis 1I » Sun Jan 19, 2020 4:16 pm

as said before, Kb = weak base, Ka = weak acid. Ka * Kb = Kw

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