What Is The POH Of A Solution With \[OH^-\] Concentration?A. 12.85 B. -13.15 C. 14.00 D. 13.15

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Understanding pH and pOH

In chemistry, pH and pOH are two fundamental concepts that describe the acidity and basicity of a solution. pH is a measure of the concentration of hydrogen ions (H^+) in a solution, while pOH is a measure of the concentration of hydroxide ions (OH^-). The relationship between pH and pOH is given by the equation:

pH + pOH = 14

Calculating pOH from [OH^-]

To calculate the pOH of a solution, we need to know the concentration of hydroxide ions ([OH^-]) in the solution. The pOH can be calculated using the following formula:

pOH = -log[OH^-]

Example Problem

Let's consider a solution with a [OH^-] concentration of 1.0 x 10^-5 M. To calculate the pOH of this solution, we can plug in the value of [OH^-] into the formula:

pOH = -log(1.0 x 10^-5)

Calculating pOH

Using a calculator, we can calculate the pOH of the solution:

pOH = -log(1.0 x 10^-5) = 5.00

Answer Choice Analysis

Now, let's analyze the answer choices:

A. 12.85: This value is not consistent with the calculated pOH of 5.00.

B. -13.15: This value is not consistent with the calculated pOH of 5.00.

C. 14.00: This value is not consistent with the calculated pOH of 5.00.

D. 13.15: This value is not consistent with the calculated pOH of 5.00.

Conclusion

Based on the calculation, the correct answer is not among the options provided. However, we can use the relationship between pH and pOH to determine the correct answer. Since pH + pOH = 14, we can calculate the pH of the solution:

pH = 14 - pOH = 14 - 5.00 = 9.00

pH and pOH Relationship

Now, let's analyze the answer choices again:

A. 12.85: This value is not consistent with the calculated pH of 9.00.

B. -13.15: This value is not consistent with the calculated pH of 9.00.

C. 14.00: This value is not consistent with the calculated pH of 9.00.

D. 13.15: This value is not consistent with the calculated pH of 9.00.

However, we can see that the correct answer is not among the options provided. The correct answer is actually 5.00, which is the calculated pOH of the solution.

Final Answer

The final answer is 5.00.

Understanding pH and pOH

In chemistry, pH and pOH are two fundamental concepts that describe the acidity and basicity of a solution. pH is a measure of the concentration of hydrogen ions (H^+) in a solution, while pOH is a measure of the concentration of hydroxide ions (OH^-). The relationship between pH and pOH is given by the equation:

pH + pOH = 14

Q&A: pH and pOH

Q: What is pH?

A: pH is a measure of the concentration of hydrogen ions (H^+) in a solution.

Q: What is pOH?

A: pOH is a measure of the concentration of hydroxide ions (OH^-) in a solution.

Q: What is the relationship between pH and pOH?

A: The relationship between pH and pOH is given by the equation: pH + pOH = 14.

Q: How do I calculate pOH from [OH^-]?

A: To calculate pOH from [OH^-], you can use the formula: pOH = -log[OH^-].

Q: What is the pH of a solution with a pOH of 5.00?

A: To calculate the pH of a solution with a pOH of 5.00, you can use the equation: pH + pOH = 14. Therefore, pH = 14 - pOH = 14 - 5.00 = 9.00.

Q: What is the pOH of a solution with a pH of 9.00?

A: To calculate the pOH of a solution with a pH of 9.00, you can use the equation: pH + pOH = 14. Therefore, pOH = 14 - pH = 14 - 9.00 = 5.00.

Q: How do I determine the pH or pOH of a solution?

A: To determine the pH or pOH of a solution, you need to know the concentration of hydrogen ions (H^+) or hydroxide ions (OH^-) in the solution. You can then use the formulas: pH = -log[H^+] or pOH = -log[OH^-] to calculate the pH or pOH.

Common Mistakes

Mistake 1: Confusing pH and pOH

Many students confuse pH and pOH, thinking that they are the same thing. However, pH is a measure of the concentration of hydrogen ions (H^+), while pOH is a measure of the concentration of hydroxide ions (OH^-).

Mistake 2: Not using the correct formula

Some students may use the wrong formula to calculate pH or pOH. For example, they may use the formula: pH = -log[OH^-] instead of pH = -log[H^+].

Mistake 3: Not considering the relationship between pH and pOH

Some students may not consider the relationship between pH and pOH, which is given by the equation: pH + pOH = 14.

Conclusion

Understanding pH and pOH is crucial in chemistry. By knowing the concentration of hydrogen ions (H^+) or hydroxide ions (OH^-) in a solution, you can calculate the pH or pOH using the formulas: pH = -log[H^+] or pOH = -log[OH^-]. Remember to consider the relationship between pH and pOH, which is given by the equation: pH + pOH = 14.

Final Tips

  • Always use the correct formula to calculate pH or pOH.
  • Consider the relationship between pH and pOH.
  • Practice calculating pH and pOH using different values of [H^+] and [OH^-].
  • Review the common mistakes to avoid them in the future.