Question

What is the [H3O+] of a solution with a pH of 2.56? 2.56 M, 2.75 x 10-3 M, 363 M, or -0.408 M

Answer 1

pH=2.56

pH=-lg[H₃O⁺]

[H₃O⁺]=10^(-pH)

[H₃O⁺]=10⁻²·⁵⁶=0.00275=2.75×10⁻³ mol/L

2.75×10⁻³ M

Answer 2

The concentration of hydronium ions in solution is
`2.75* 10^(-3) M`.

Step-by-step explanation:

The pH of the solution is defined as negative logarithm of hydronium ions concentration in a solution. Mathematically written as:

`pH=-\log[H_3O^+]`

Given, the pH of the solution = 2.56

`2.56=-\log[H_3O^+]`

`[H_3O^+]=0.002754 M=2.75* 10^(-3) M`

The concentration of hydronium ions in solution is
`2.75* 10^(-3) M`.