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To calculate the pH of a solution when the hydronium ion concentration \([H_3O^+]\) is given, we use the following formula:

\[
\text{pH} = -\log [H_3O^+]
\]

In this case, the hydronium ion concentration is \( 0.00278 \, \text{M} \).

Now, let's calculate the pH:

\[
\text{pH} = -\log (0.00278)
\]

\[
\text{pH} \approx 2.556
\]

Thus, the pH of the solution is approximately **2.56**, to three significant figures.

Would you like more details or clarifications on this calculation? Here are some related questions:

1. What is the significance of pH in a solution?
2. How does pH affect the chemical properties

The hydronium ion concentration of a solution is 0.00278 M. Calculate the pH of a solution. Write answer to three significant figures.

Learn how to calculate the pH of a solution with a hydronium ion concentration of 0.00278 M using the formula pH = -log[H₃O⁺]. The final pH value is approximately 2.56, presented to three significant figures. Suitable for high school students.

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