Which of these correcty dethes the pitctasolution? the negative log of the hydronium ion concentration the log of the hydronium ion concentration the negative log of the hydroxide ion concentration the log of the hydroxide ion concentration

The correct answer is: the negative log of the hydronium ion concentration.

The pH scale is a measure of the acidity or basicity of a solution. It is defined as the negative logarithm of the concentration of hydronium ions (H3O+) in a solution. The formula for calculating pH is:

pH = -log[H3O+]

Where [H3O+] represents the concentration of hydronium ions in the solution.

The other options are incorrect:

- The log of the hydronium ion concentration is not the definition of pH.
- The negative log of the hydroxide ion concentration is not the definition of pH.
- The log of the hydroxide ion concentration is not the definition of pH.

Therefore, the correct answer is the negative log of the hydronium ion concentration.