How to Use the pH Calculator

This tool helps you calculate various pH-related values for chemical solutions. Follow these steps:

1. Select the calculation type from the dropdown menu
2. Enter the required values in the input fields
3. Click "Calculate" to see the results
4. Check "Show Calculation Steps" to see the detailed process

Calculation Types

• pH from [H⁺]: Calculates pH from hydrogen ion concentration (pH = -log[H⁺])
• pOH from [OH⁻]: Calculates pOH from hydroxide ion concentration (pOH = -log[OH⁻])
• [H⁺] from pH: Calculates hydrogen ion concentration from pH ([H⁺] = 10^(-pH))
• [OH⁻] from pOH: Calculates hydroxide ion concentration from pOH ([OH⁻] = 10^(-pOH))
• Strong Acid/Base: Automatically calculates pH/pOH for strong acids/bases
• Weak Acid/Base: Uses Ka/Kb values to calculate pH/pOH for weak acids/bases

Key Relationships

• pH + pOH = 14 (at 25°C)
• [H⁺] × [OH⁻] = 1.0 × 10⁻¹⁴ (at 25°C)
• For weak acids: [H⁺] = √(Ka × [HA])
• For weak bases: [OH⁻] = √(Kb × [B])