## Chemistry: The Molecular Science (5th Edition)

Hydronium ion concentration: $[H_3O^+] = 5.012 \times 10^{- 5}M$
$[H_3O^+] = 10^{-pH}$ $[H_3O^+] = 10^{- 4.3}$ $[H_3O^+] = 5.012 \times 10^{- 5}M$ - Solutions with pH < 7* are considered acidics. * Which means $[H_3O^+] > 10^{-7}M$.