KIMIA : Larutan Penyangga part 2

Standar

1. Buffer asam

[H+] = Ka. [asam lemah] / [garam]

atau

[H+] = Ka. Mol asam lemah / mol garam

pH = -log [H+]

       = – log Ka. [asam lemah] / [garam]

       = -log Ka – log [asam lemah] / [garam]

       = -log Ka + log [garam] / [asam lemah]

       = pKa + log [garam] / [asam lemah]

 

2. Buffer basa

[OH] = Kb. [basa lemah] / [garam]

atau

[OH] = Kb. Mol basa lemah / mol garam

 

pOH = -log [OH]

          = – log Kb. [basa lemah] / [garam]

          = -log Kb – log [basa lemah] / [garam]

          = -log Kb + log [garam] / [basa lemah]

          = pKb + log [garam] / [basa lemah]

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