Question

PLEASE HELP!!!!!

The pH of a solution is 3.40. What is the [H3O+] for the solution?


2.51 × 10−4 M

3.98 × 10−4 M

2.51 × 103 M

3.98 × 104 M

Answer 1

Answer: The hydronium ion concentration for the solution is
`3.98* 10^(-4)M`

Step-by-step explanation:

pH is defined as the negative logarithm of hydrogen ion concentration or hydronium ion concentration present in a solution.

To calculate the pH of the reaction, we use the equation:

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

We are given:

pH of the solution = 3.40

Putting values in above equation, we get:

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

`[H_3O^+]=3.98* 10^(-4)M`

Hence, the hydronium ion concentration for the solution is
`3.98* 10^(-4)M`

Answer 2

3.98 x 10⁻⁴ M.

Explanation:

∵ pH = - log[H₃O⁺]

∴ 3.4 = - log[H₃O⁺].

∴ log[H₃O⁺] = - 3.4.

∴ [H₃O⁺] = 3.98 x 10⁻⁴ M.