What is the relationship of the concentration of H3O and of OH

Answer 1

Hi Dee, this is ez!

H3O+ is an hydronium ion, a Lewis acid and OH-, hydroxide ion is a Lewis base.

Reaction between hydronium and hydroxide yields water molecules

H3O+ + OH- ----> 2H2O
This is called a neutralization reaction.

Answer 2

Another relationship is
(H3O^+)(OH^-) = Kw = 1E-14 @ 25 C.