pKa, Ka, and relative acid strength

Moderators: Chem_Mod, Chem_Admin

Clarissa Cabil 1I
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

pKa, Ka, and relative acid strength

Postby Clarissa Cabil 1I » Wed Jan 23, 2019 3:34 pm

Just to clarify,

the larger the Ka, the stronger the acid

and

the lower the pKa, the stronger the acid?

Kim Tran 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: pKa, Ka, and relative acid strength

Postby Kim Tran 1J » Wed Jan 23, 2019 3:58 pm

Yes, you are right.

The larger the Ka, the stronger the acid. The smaller the pKa, the stronger the acid
And the same applies for bases, the larger the Kb, the stronger the base. The smaller the pKb, the stronger the base

Grace Kim 1J
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

Re: pKa, Ka, and relative acid strength

Postby Grace Kim 1J » Wed Jan 23, 2019 4:02 pm

You are correct!

I believe it is the same for bases; decreasing pKb and increasing Kb will correspond to increasing base strength.

An example of this concept can be found in 12.39 in the 6th edition.

Sarah Fatkin 4I
Posts: 71
Joined: Fri Sep 28, 2018 12:27 am

Re: pKa, Ka, and relative acid strength

Postby Sarah Fatkin 4I » Wed Jan 23, 2019 4:09 pm

You're right! Because pKa is the -log of Ka, when Ka is larger and the acid is stronger, pKa is decreased.


Return to “Calculating pH or pOH for Strong & Weak Acids & Bases”

Who is online

Users browsing this forum: No registered users and 2 guests