pKa vs pH

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Andrew Liang 1I
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

pKa vs pH

Postby Andrew Liang 1I » Thu Jan 23, 2020 3:39 pm

What is the difference between pKa and pH?

Ally Huang- 1F
Posts: 103
Joined: Thu Jul 25, 2019 12:16 am

Re: pKa vs pH

Postby Ally Huang- 1F » Thu Jan 23, 2020 3:40 pm

pKa is the -log of an acidity constant and pH is the -log of the hydronium ion concentration.

Brittney Hun 2C
Posts: 104
Joined: Wed Sep 11, 2019 12:15 am

Re: pKa vs pH

Postby Brittney Hun 2C » Thu Jan 23, 2020 3:46 pm

pH shows the scale of acidity and how basic something is more so than the pKa. You can undo the pKA by raising it to 10^- and finding the Ka. By using an ice table you can find the pH using the equilibrium expression.

Tauhid Islam- 1H
Posts: 64
Joined: Fri Aug 02, 2019 12:15 am

Re: pKa vs pH

Postby Tauhid Islam- 1H » Thu Jan 23, 2020 11:42 pm

pH=-log(concentration of H3O ions) while pKa=-log(acidity constant which is the ratio between the concentrations of hydronium ions times concentration of the acid's conjugate base divided by concentration of the acid)

Connie Chen 1E
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Re: pKa vs pH

Postby Connie Chen 1E » Fri Jan 24, 2020 10:18 am

To add on, pH can change depending the concentration of an acid in a reaction, whereas pKa does not change based on concentration because it is the -log of an equilibrium constant.

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