Calculate [H_3O^+] for a solution of hydroiodic acid for which pH = 2.31. Round your answer to 2 significant figures.

Answer 1

To calculate the concentration of [H3O+], we can use the formula:

pH = -log[H3O+]

First, convert the pH to [H3O+] using the formula:

[H3O+] = 10^(-pH)

[H3O+] = 10^(-2.31)
[H3O+] = 4.7 x 10^(-3)

Therefore, the concentration of [H3O+] for the solution of hydroiodic acid is 4.7 x 10^(-3) M. Rounded to 2 significant figures, the answer is 4.7 x 10^(-3) M.