Base Strength

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Abby Ellstrom 1I
Posts: 53
Joined: Fri Sep 29, 2017 6:04 am

Base Strength

Postby Abby Ellstrom 1I » Fri Dec 08, 2017 12:33 am

What makes one base stronger than another? I understand the rules for acids but the base rules seemed unclear.

Rachel Lu_dis1H
Posts: 66
Joined: Fri Sep 29, 2017 6:06 am
Been upvoted: 1 time

Re: Base Strength

Postby Rachel Lu_dis1H » Fri Dec 08, 2017 11:20 am

I think you can look at its conjugate acid. If its conjugate acid is weaker then the base if stronger. So if you had two bases, look at both its conjugate acids and whichever conjugate acid is weaker, that base is stronger.

Kourtney Nham 1L
Posts: 20
Joined: Fri Sep 29, 2017 6:04 am

Re: Base Strength

Postby Kourtney Nham 1L » Fri Dec 08, 2017 12:21 pm

To add on, this effect is called the conjugate seesaw. The stronger the acid, the weaker its conjugate base and the stronger the base, the weaker its conjugate acid. We can derive this from the fact that we know [Ka][Kb]=10^-14. Therefore, as Ka increases, Kb must decrease and vice versa. The larger the Ka/Kb, the stronger the acid/base.

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