What is a Bronsted-Lowry acid?

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Answer 1 · 2018-08-08T05:06:16

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A #"Bronsted-Lowry acid"# is a species that DONATES a proton in the form of an hydrogen ion...

#2H_2O(l) rightleftharpoonsH_3O^+ + HO^-#

And, here, water molecules has acted as a #"Bronsted-Lowry acid"# AND as a #"Bronsted-Lowry BASE"#, a proton acceptor...

Of course in water under standard conditions, the given equilibrium is measurable...

i.e. #K_w=[HO^-][H_3O^+]=10^(-14)#...

And taking logs of both sides...

#-log_10^(-14)=log_10[H_3O^+]+log_10[HO^-]#

And so...

#+log_10^(-14)=underbrace(-log_10[H_3O^+]-log_10[HO^-])_(pH+pOH=14)#

And you will use this relationship a lot...

#14=pH+pOH#...