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Calculate Ph of 0.01 Molar Solution of Sodium Hydroxide

Reviewed by Calculator Editorial Team

This calculator helps you determine the pH of a 0.01 molar solution of sodium hydroxide (NaOH). Sodium hydroxide is a strong base that completely dissociates in water, making it ideal for pH calculations. Understanding the pH of a NaOH solution is essential in chemistry, environmental science, and industrial applications.

Introduction

The pH scale measures how acidic or basic a solution is, ranging from 0 (most acidic) to 14 (most basic). A pH of 7 is neutral. Sodium hydroxide (NaOH) is a strong base that dissociates completely in water, producing hydroxide ions (OH⁻).

For a 0.01 molar solution of NaOH, we can calculate the pH using the concentration of hydroxide ions and the equilibrium constant for water dissociation.

How to Calculate pH

The pH of a solution can be calculated using the following steps:

  1. Determine the concentration of hydroxide ions (OH⁻).
  2. Calculate the pOH using the concentration of hydroxide ions.
  3. Convert pOH to pH using the relationship pH + pOH = 14.

Key Formulas

For a strong base like NaOH:

[OH⁻] = [NaOH] = 0.01 M

pOH = -log[OH⁻]

pH = 14 - pOH

For a 0.01 molar solution of NaOH:

  1. The concentration of hydroxide ions is equal to the concentration of NaOH: [OH⁻] = 0.01 M.
  2. Calculate pOH: pOH = -log(0.01) = 2.
  3. Calculate pH: pH = 14 - pOH = 14 - 2 = 12.

Example Calculation

Let's calculate the pH of a 0.01 molar solution of NaOH step by step.

Step-by-Step Calculation

  1. Given: [NaOH] = 0.01 M
  2. Since NaOH is a strong base, [OH⁻] = [NaOH] = 0.01 M
  3. pOH = -log[OH⁻] = -log(0.01) = 2
  4. pH = 14 - pOH = 14 - 2 = 12

The pH of a 0.01 molar solution of NaOH is 12. This indicates a strongly basic solution.

Interpreting Results

A pH of 12 for a 0.01 molar NaOH solution means:

  • The solution is highly basic.
  • It has a high concentration of hydroxide ions.
  • It can neutralize acids effectively.

Key Points

  • Strong bases like NaOH dissociate completely in water.
  • The pH of a strong base solution can be calculated directly from its concentration.
  • Solutions with pH > 7 are basic, while those with pH < 7 are acidic.

Frequently Asked Questions

What is the pH of a 0.01 molar NaOH solution?
The pH of a 0.01 molar NaOH solution is 12.
How do you calculate the pH of a strong base?
For a strong base like NaOH, the pH can be calculated using the formula: pH = 14 + log[Base].
Is NaOH a strong or weak base?
NaOH is a strong base because it completely dissociates in water.
What does a pH of 12 indicate?
A pH of 12 indicates a highly basic solution with a high concentration of hydroxide ions.
Can I use this calculator for other strong bases?
Yes, the same method can be applied to other strong bases like KOH and Ca(OH)₂.