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Calculate Ph of 0.005 M Naoh

Reviewed by Calculator Editorial Team

Calculating the pH of a sodium hydroxide (NaOH) solution is essential in chemistry and laboratory work. This guide explains how to determine the pH of a 0.005 molar NaOH solution using our calculator and provides a detailed explanation of the process.

Introduction

The pH scale measures how acidic or basic a solution is. Sodium hydroxide (NaOH) is a strong base that dissociates completely in water, producing hydroxide ions (OH⁻). The pH of a NaOH solution can be calculated using the concentration of hydroxide ions.

In this guide, we'll calculate the pH of a 0.005 molar NaOH solution. We'll use the formula for pH in terms of hydroxide concentration and explain each step of the calculation.

How to Calculate pH

To calculate the pH of a NaOH solution, follow these steps:

  1. Determine the concentration of hydroxide ions (OH⁻) in the solution.
  2. Use the pH formula for hydroxide concentration: pH = 14 + log[OH⁻].
  3. Calculate the logarithm of the hydroxide ion concentration.
  4. Add 14 to the logarithm result to get the pH.

pH = 14 + log[OH⁻]

For a 0.005 M NaOH solution, the concentration of hydroxide ions is equal to the concentration of NaOH because NaOH completely dissociates in water.

Example Calculation

Let's calculate the pH of a 0.005 M NaOH solution step by step.

  1. Given: [NaOH] = 0.005 M
  2. Since NaOH is a strong base, [OH⁻] = [NaOH] = 0.005 M
  3. Calculate log[OH⁻] = log(0.005)
  4. Using a calculator: log(0.005) ≈ -2.3010
  5. Apply the pH formula: pH = 14 + (-2.3010) = 11.6990
  6. Round to two decimal places: pH ≈ 11.70

The pH of a 0.005 M NaOH solution is approximately 11.70, indicating it is a strong base.

Interpreting Results

The pH of a 0.005 M NaOH solution is approximately 11.70. This value indicates that the solution is highly basic, as pH values above 7 are considered basic.

Key points to remember:

  • pH values range from 0 (acidic) to 14 (basic).
  • A pH of 7 is neutral.
  • Values below 7 are acidic, and values above 7 are basic.
  • Strong bases like NaOH have high pH values.

Frequently Asked Questions

What is the pH of a 0.005 M NaOH solution?
The pH of a 0.005 M NaOH solution is approximately 11.70.
How do you calculate the pH of a NaOH solution?
Use the formula pH = 14 + log[OH⁻], where [OH⁻] is the concentration of hydroxide ions, which equals the concentration of NaOH for strong bases.
Why is the pH of a NaOH solution high?
NaOH is a strong base that completely dissociates in water, producing a high concentration of hydroxide ions, resulting in a high pH.
What does a pH of 11.70 indicate?
A pH of 11.70 indicates a strongly basic solution, which is highly alkaline.
Can the pH of a NaOH solution be calculated using the pOH?
Yes, you can use pOH = 14 - pH, but the direct formula pH = 14 + log[OH⁻] is more straightforward for NaOH solutions.