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Calculate Ph of 0.2 M Naoh

Reviewed by Calculator Editorial Team

Sodium hydroxide (NaOH) is a strong base that completely dissociates in water to produce hydroxide ions (OH⁻). This calculator helps determine the pH of a 0.2 molar NaOH solution using the pH formula for strong bases.

Introduction

The pH of a solution measures its acidity or alkalinity on a scale from 0 to 14. For strong bases like NaOH, the pH can be calculated directly from the concentration of hydroxide ions. A 0.2 M NaOH solution has a pH of approximately 13.30.

Key Formula

For strong bases: pOH = -log[OH⁻]

Since [OH⁻] = [NaOH] for strong bases, pOH = -log[NaOH]

pH = 14 - pOH

This calculator uses these relationships to provide an accurate pH value for any concentration of NaOH solution.

How to Calculate pH of NaOH Solution

Calculating the pH of a NaOH solution involves these steps:

  1. Determine the concentration of NaOH in moles per liter (M)
  2. Calculate pOH using the formula: pOH = -log[OH⁻]
  3. Convert pOH to pH using: pH = 14 - pOH

Note: This method works for strong bases that completely dissociate in water. For weak bases, a different approach is needed.

The calculator automates these steps for quick and accurate results.

Example Calculation

Let's calculate the pH of a 0.2 M NaOH solution:

  1. Given: [NaOH] = 0.2 M
  2. Calculate pOH: pOH = -log(0.2) = 0.6990
  3. Calculate pH: pH = 14 - 0.6990 = 13.3010

The pH of a 0.2 M NaOH solution is approximately 13.30.

Frequently Asked Questions

What is the pH of a 0.2 M NaOH solution?
The pH of a 0.2 M NaOH solution is approximately 13.30.
How does the concentration of NaOH affect the pH?
For strong bases, the pH increases as the concentration of NaOH increases. Higher concentrations result in higher pH values.
Can this formula be used for weak bases?
No, this formula only applies to strong bases that completely dissociate in water. Weak bases require a different calculation method.
What is the pOH of a 0.2 M NaOH solution?
The pOH of a 0.2 M NaOH solution is approximately 0.70.
How accurate is this calculator?
This calculator provides results accurate to four decimal places using standard pH calculation methods.