1. What is pH Calculation for H₂SO₄?

pH calculation for sulfuric acid (H₂SO₄) solutions involves determining the hydrogen ion concentration. H₂SO₄ is a strong diprotic acid where the first proton completely dissociates and the second proton partially dissociates. For dilute solutions, we approximate [H⁺] ≈ 2C.

2. How Does the Calculator Work?

The calculator uses the pH formula for H₂SO₄ solutions:

Where:

• \( C \) — Concentration of H₂SO₄ (mol/L)
• 2 — Factor accounting for two protons from H₂SO₄
• log — Base-10 logarithm

Explanation: The equation calculates pH based on the approximate hydrogen ion concentration [H⁺] = 2C for sulfuric acid solutions.

3. Importance of pH Calculation

Details: Accurate pH calculation is essential for understanding acid-base chemistry, chemical reactions, industrial processes, and environmental monitoring where sulfuric acid is involved.

4. Using the Calculator

Tips: Enter the concentration of H₂SO₄ in mol/L. The default value is set to 0.0025 mol/L as specified. Concentration must be a positive value.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 2 in the calculation?
A: H₂SO₄ provides two protons (H⁺ ions) per molecule, so [H⁺] ≈ 2 × concentration for the calculation.

Q2: Is this approximation accurate for all concentrations?
A: This approximation works well for dilute solutions. For concentrated H₂SO₄, more complex calculations considering second dissociation constant are needed.

Q3: What is the pH range for acid solutions?
A: Acid solutions have pH < 7. The lower the pH, the stronger the acidity. pH 0-2 indicates strong acids.

Q4: How does temperature affect pH calculation?
A: Temperature affects the dissociation constants and water autoionization, but for most practical purposes at room temperature, this calculation is sufficient.

Q5: Can I use this for other strong acids?
A: For monoprotic strong acids like HCl, use [H⁺] = C. For diprotic acids, adjustment is needed based on their dissociation behavior.