pOH Calculator

    Calculate the pOH and pH of strong and weak acids/bases with ease.

    Calculate pOH

    About pOH Calculations

    pOH is a measure of the hydroxide ion concentration in a solution. It is complementary to pH, and together they help describe the acidity or basicity of a solution. The sum of pH and pOH always equals 14 in aqueous solutions at 25°C.

    •Features

    • –Calculate pOH for strong and weak acids/bases
    • –Automatically calculate corresponding pH
    • –Handle various concentration ranges
    • –Account for acid/base dissociation constants

    •How to Use

    1. 1.Select the type of substance (strong/weak acid/base)
    2. 2.Enter the concentration in moles per liter (M)
    3. 3.For weak acids/bases, input the Ka/Kb value
    4. 4.Click calculate to find both pOH and pH values

    •Key Concepts

    • –pOH Scale: 0-14 range
    • –pH + pOH = 14: Fundamental relationship
    • –Strong Bases: Complete dissociation
    • –Weak Bases: Partial dissociation

    •Formulas Used

    • –Strong Base: pOH = -log[OH⁻]
    • –Weak Base: pOH = -log√(Kb × Cb)
    • –pH-pOH Relationship: pH + pOH = 14
    • –Kw: [H⁺][OH⁻] = 10⁻¹⁴ at 25°C

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