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Calculate Ph of 0.05m H2so4

Reviewed by Calculator Editorial Team

Sulfuric acid (H2SO4) is a strong acid that completely dissociates in water. Calculating its pH helps understand its acidity level. This guide explains how to determine the pH of a 0.05 molar solution of sulfuric acid.

Introduction

The pH scale measures how acidic or basic a solution is. It ranges from 0 to 14, where:

  • pH 0-6 is acidic
  • pH 7 is neutral
  • pH 8-14 is basic

For strong acids like H2SO4, the pH can be calculated directly from the concentration using the formula:

pH = -log10[H+]

Since H2SO4 completely dissociates, the concentration of H+ ions equals the molar concentration of the acid.

How to Calculate pH

  1. Determine the molar concentration of the acid solution (M).
  2. For strong acids, the concentration of H+ ions equals the molar concentration.
  3. Apply the pH formula: pH = -log10[H+].
  4. Calculate the negative logarithm (base 10) of the H+ concentration.

Note: This method works for strong acids only. For weak acids, additional calculations are needed to account for dissociation.

Formula

The pH of a strong acid solution can be calculated using this simple formula:

pH = -log10(M)

Where M is the molar concentration of the acid solution.

For our example with 0.05M H2SO4:

pH = -log10(0.05)

Example Calculation

Let's calculate the pH of a 0.05 molar solution of sulfuric acid:

  1. Identify the molar concentration: M = 0.05
  2. Since H2SO4 is a strong acid, [H+] = 0.05
  3. Calculate the pH: pH = -log10(0.05)
  4. Using a calculator: log10(0.05) ≈ 1.3010
  5. Therefore, pH = -1.3010 ≈ 1.30

The pH of a 0.05M H2SO4 solution is approximately 1.30, indicating a very acidic solution.

Interpreting Results

A pH of 1.30 means the solution is highly acidic. Here's what this means:

  • The concentration of H+ ions is 0.05 molar
  • The solution is 100 times more acidic than a pH 3 solution
  • It would react strongly with bases and metals
  • It would turn blue litmus paper red

Warning: Concentrated sulfuric acid is extremely corrosive and can cause severe burns. Always handle with proper protective equipment.

FAQ

What is the pH of 0.05M H2SO4?

The pH of a 0.05 molar solution of sulfuric acid is approximately 1.30.

How do you calculate pH from concentration?

For strong acids, use the formula pH = -log10(M), where M is the molar concentration.

Why is sulfuric acid considered a strong acid?

Sulfuric acid completely dissociates in water, so the concentration of H+ ions equals the molar concentration of the acid.

What does a pH of 1.30 indicate?

A pH of 1.30 indicates a highly acidic solution that would react strongly with bases and metals.