The Mystery of Hydroxide Ion Concentration Revealed

What is the hydroxide ion concentration in a solution with a pH of 9.65?

A. 4.47 × 10^-23 M

B. 4.47 × 10^-5 M

C. 2.32 × 10^-10 M

D. 1.52 × 10^-10 M

Final answer:

The hydroxide ion concentration in a solution with a pH of 9.65 is B. 4.47 × 10^-5 M.

Have you ever wondered how to determine the hydroxide ion concentration in a solution based on its pH value? Let's uncover the mystery!

The pH of a solution is a measurement of its acidity or basicity, with lower pH values indicating acidity and higher pH values indicating basicity. The hydroxide ion concentration in a solution is related to its pH value through the concept of pOH, which is the negative logarithm of the hydroxide ion concentration.

To find the hydroxide ion concentration in a solution with a pH of 9.65, we first need to calculate the pOH. The formula to calculate pOH is pOH = 14 - pH. In this case, if the pH is 9.65, then the pOH would be 14 - 9.65 = 4.35.

Next, we can determine the hydroxide ion concentration using the formula [OH-] = 10^(-pOH). Substituting the pOH value we calculated earlier (4.35) into the formula, we get [OH-] = 10^(-4.35), which is approximately equal to 4.47 × 10^-5 M.

Therefore, the hydroxide ion concentration in a solution with a pH of 9.65 is 4.47 × 10^-5 M, making option B the correct answer. Understanding the relationship between pH and hydroxide ion concentration is essential in chemistry and can help you make accurate calculations for various solutions.