To calculate the concentration of hydronium ions \([\text{H}_3\text{O}^+]\) from the pH, you can use the following formula:
\[ [\text{H}_3\text{O}^+] = 10^{-\text{pH}} \]
Given that the pH is 5.79, we can substitute this value into the equation:
\[ [\text{H}_3\text{O}^+] = 10^{-5.79} \]
Now, performing the calculation:
\[ [\text{H}_3\text{O}^+] \approx 1.64 \times 10^{-6} \text{ M} \]
The pH value of 5.79 has three significant figures, so our final answer for \([\text{H}_3\text{O}^+]\) should also reflect three significant figures:
\[ [\text{H}_3\text{O}^+] = 1.64 \times 10^{-6} \text{ M} \]