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Notes
      3. Old stuff
          3.2. Old physio stuff (around 2005)
              3.2.3. Physiology
                  3.2.3.1. Acid and base
                      3.2.3.1.1. Basics of acid-base
 3.2.3.1.1.1. Definitions of acid and base 

Definitions of acid and base

 

Traditional approach

Acid: a substance that has certain properties

(eg sour taste, turns litmus red)

Arrhenius approach 

Acid : H+ in aqueous solution

Base : OH- in aqueous solution

  • At neutrality: [H+] = [OH-]

Bronsted-Lowry approach

Acid : H+ donor

Base : H+ acceptor

  • Conjugate acid-base pairs
  • No concept of neutrality

Lewis approach

Acid : a potential electron-pair acceptor

Base : a potential electron-pair donor

Usanovich  apporach

Acid: a substance that donates a cation, or accepts an anion or an electron

Base: a substance that donates an anion, or accepts a cation

 

Other notes

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