Question

In a solution with a pH of 4, the [OH-] is:
1x 10-10
1x 10-4
10
- 1x 10-8
​

Answer 1

1 x 10^-4

Step-by-step explanation:

Use the equation pH = -log[OH-}

Rearranging it [OH-] = 10^-pH

Plugging in we get [OH-] = 1 x 10^-4

Answer 2

For a solution with a pH of 4, the hydroxide ion concentration [OH-] is calculated by subtracting the pH from 14 to get the pOH, and then finding 10^-pOH, resulting in [OH-] = 1 x 10⁻¹⁰ M.

So, the correct answer is option 1) 1 x 10⁻¹⁰.

Step-by-step explanation:

The question resolves around finding the hydroxide ion concentration ([OH-]) in a solution with a specific pH. To calculate the [OH-] for a solution with a pH of 4, we use the relationship where the sum of the pH and pOH equals 14. First, we find the pOH by subtracting the given pH from 14:

pOH = 14 - pH = 14 - 4 = 10.

Then, we use the pOH to determine the hydroxide ion concentration:

• [OH-] = 10^-pOH
• [OH-] = 10⁻¹⁰

The [OH-] in a solution with a pH of 4 is therefore 1 x 10⁻¹⁰ M.

So, the correct answer is option 1) 1 x 10⁻¹⁰.