7). The pH of a solution is 2.89. What is the [H3O+]?

A) 1.3 X10–3 M H3O+
B) 1.3 X 1012 M H3O+
C) 7.9 X101 M H3O+
D) 7.9 X 10–13 M H3O+
E) 1.9 M H3O+

How about suugesting an answer?

To find the concentration of [H3O+], we need to use the equation for pH:

pH = -log[H3O+]

First, plug in the given pH value of 2.89 into the equation:

2.89 = -log[H3O+]

Next, rearrange the equation to solve for [H3O+]:

-log[H3O+] = 2.89

To remove the negative sign, flip the equation:

log[H3O+] = -2.89

Now, take the antilog of both sides to get rid of the logarithm:

[H3O+] = 10^(-2.89)

Calculating this value, we find that [H3O+] is approximately 1.3 x 10^(-3) M.

Therefore, the correct answer is option A) 1.3 x 10^(-3) M H3O+.