Calculate the pH of a 0.1 M NaOH solution.

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Question: Calculate the pH of a 0.1 M NaOH solution.

Options:

Correct Answer: 14

Solution:

pOH = -log[OH-] = -log(0.1) = 1, thus pH = 14 - pOH = 14 - 1 = 13.

Calculate the pH of a 0.1 M NaOH solution.

Calculate the pH of a 0.1 M NaOH solution.

Step 1: Identify the concentration of the NaOH solution, which is 0.1 M. NaOH is a strong base and fully dissociates in water.
Step 2: Determine the concentration of hydroxide ions (OH-) in the solution. Since NaOH dissociates completely, [OH-] = 0.1 M.
Step 3: Calculate the pOH using the formula pOH = -log[OH-]. Substitute [OH-] with 0.1: pOH = -log(0.1).
Step 4: Calculate -log(0.1). This equals 1, so pOH = 1.
Step 5: Use the relationship between pH and pOH, which is pH + pOH = 14. To find pH, rearrange the equation: pH = 14 - pOH.
Step 6: Substitute pOH into the equation: pH = 14 - 1.
Step 7: Calculate pH: pH = 13.

pH and pOH Calculations – Understanding the relationship between pH, pOH, and the concentration of hydroxide ions in a solution.
Strong Base Properties – Recognizing that NaOH is a strong base that fully dissociates in solution, leading to a direct calculation of [OH-].