Hello!
The concentration of hydronium ions is related to pH by the following simple equation:
[tex]pH=-log[H_3O^{+}] [/tex]
From this equation, you can see that as the hydronium concentration is higher, the pH will be lower.
The concentration of the OH⁻ ions is related to the pH by the following set of equations
[tex]pOH=-log[OH^{-}] \\ pH=14-pOH[/tex]
You can see that as the concentration of OH⁻ is higher, the pOH is lower and thus the pH is higher.
When the pH of the solution is less than 7, the solution is acidic.
When the pH of the solution is higher than 7, the solution is basic.
Have a nice day!
