Relationship between Kpa and Ph

Acidity
Basicity
The Conjugate Seesaw

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torialmquist1F
Posts: 49
Joined: Sat Jul 22, 2017 3:00 am

Relationship between Kpa and Ph

Postby torialmquist1F » Thu Dec 07, 2017 6:12 pm

Is there a direct relationship between Ka and pH, or Kb and pOH?/

Ishan Saha 1L
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

Re: Relationship between Kpa and Ph

Postby Ishan Saha 1L » Thu Dec 07, 2017 6:23 pm

Ka describes the rate at which the acid deprotonizes and gives an H+ atom to H20. The concentration of H30+ is described by pH. Kb is the same except for bases, where Kb describes the rate at which the base gains protons from H20, and pOH represents the concentration of OH- molecules.

Clarisse Wikstrom 1H
Posts: 63
Joined: Fri Sep 29, 2017 7:05 am

Re: Relationship between Kpa and Ph

Postby Clarisse Wikstrom 1H » Thu Dec 07, 2017 6:26 pm

pH and pOH take the -log[ H+ or OH-]. They are not the same as their respective Ka or Kb, which shows the relationship between all concentrations in the rxn, not just [H+] or [OH-].

Navleen Bajwa 3A
Posts: 20
Joined: Fri Sep 29, 2017 7:06 am

Re: Relationship between Kpa and Ph

Postby Navleen Bajwa 3A » Fri Dec 08, 2017 12:39 am

pH of a solution is the negative logarithm of the hydronium ion activity. Ka is the acid ionization constant or acid dissociation constant. The weaker the acid is, which depends on the pH level, the smaller the value of Ka. Kb is the base ionization constant, and the smaller the value of Kb, the ability of the base to accept a proton becomes weaker. pH and pOH have complementary values; if one increases, the other decreases so that their sum remains constant.


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