How is pH calculated?Question 2Select one:a.log[H33O++]b.−log−log[OH−−]c.−log−log[H33O++]d.log[OH−−]

To calculate pH, we can break down the problem into the following steps:

1. ### Break Down the Problem

We need to determine which option correctly represents the formula for calculating pH. The pH is a measure of the hydrogen ion concentration in a solution.

2. ### Relevant Concepts

The pH is calculated using the formula: $\text{pH} = -\log[H_3O^+]$ where $[H_3O^+]$ is the concentration of hydronium ions in moles per liter.

3. ### Analysis and Detail

1. Option (a) states: $\log[H_3O^+]$, which is incorrect because the pH formula requires the negative logarithm.
2. Option (b) states: $-\log-\log[OH^-]$, which does not make sense in the context of calculating pH.
3. Option (c) states: $-\log[H_3O^+]$, which is correct as it directly uses the pH formula.
4. Option (d) states: $\log[OH^-]$, which is incorrect because it relates to the pOH, not the pH.

4. ### Verify and Summarize

From the analysis, option (c) correctly represents the pH calculation, as it directly applies the formula needed to find pH.

Final Answer

The correct option is c. $-\log[H_3O^+]$.