Answer: D. [tex]1.0\times 10^{-8.43}M[/tex]
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydronium ion concentration.
[tex]pH=-\log [H_3O^+][/tex]
Putting in the values:
[tex]8.43=-\log[H_3O^+][/tex]
[tex][H_3O^+]=10^{-8.43}=3.7\times 10^{-9}M[/tex]
Thus [tex][H_3O^+][/tex] concentration is [tex]10^{-8.43}M[/tex]
