Question

What is the ph of a solution with [h30 ] = 2.8 x 10-5 m?

a) pH 5.55
b) pH 4.55
c) pH 6.55
d) pH 7.55

Answer 1

The pH of a solution with [H3O+] = 2.8 x 10-5 M is pH 4.55.

Step-by-step explanation:

The pH of a solution can be found by taking the negative log of the hydronium ion concentration ([H3O+]). In this case, the given [H3O+] is 2.8 x 10-5 M. Using the formula pH = -log[H3O+], we can calculate the pH as follows:

pH = -log(2.8 x 10-5)

pH = 4.55

Therefore, the pH of the solution is pH 4.55 (option b).

Answer 2

`\huge{ \boxed{4.55}}`

Step-by-step explanation:

pH is defined as the negative logarithm of
`{H_3O}^(+)` concentration of a substance and it's given by the formula:

`\bold{pH = -log([{H_3O}^(+)])}`

From the question:

`[ {H_3O}^(+) ] = 2.8 * 10^(-5) M`

`\therefore \: pH = - log(2.8 * {10}^( - 5) ) \\ = 4.55`