Question

What is the [h3o ] for a solution of seawater at 25°c that has a ph of 8.3?

Answer 1

pH of solution at 25ºC = 8.3

$[ H_3O^+] = 10 ^{-pH}$

${H_3O^+] = 10 ^{-8.3}$

$[H_3O^+] = 5.011*10^{-9} M$

hope this helps!