What is the concentration (in M) of hydronium ions in a solution at 25 degrees C with a pH = 4.282?

i got 5.22 x 10^-5
?

right on the money.

To calculate the concentration of hydronium ions (H3O+) in a solution from the pH, you can use the equation:

pH = -log[H3O+]

To find the concentration, you need to convert the pH value back into a concentration.

First, rearrange the equation:

[H3O+] = 10^(-pH)

Now, substitute the given pH value into the equation:

[H3O+] = 10^(-4.282)

Using a calculator, evaluate the expression:

[H3O+] ≈ 5.22 × 10^(-5) M

So, you are correct! The concentration of hydronium ions in the solution is approximately 5.22 × 10^(-5) M.