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How to Calculate pOH from pH: A Simple Guide for Students and Professionals

Understanding the relationship between pH and pOH is essential in chemistry, biology, and environmental science. Whether you’re a student working through acid–base problems or a lab technician analyzing water quality, knowing how to calculate pOH from pH helps you determine the balance between acidic and basic solutions quickly and accurately.

What Are pH and pOH?

  • pH measures the concentration of hydrogen ions (H⁺) in a solution.

    • Low pH (<7) means the solution is acidic.

    • High pH (>7) means it’s basic.

    • pH = 7 is neutral, like pure water.

  • pOH measures the concentration of hydroxide ions (OH⁻) in a solution.

    • Low pOH indicates a basic solution.

    • High pOH indicates an acidic solution.

The Relationship Between pH and pOH

The key formula linking pH and pOH is:

[
\text{pH} + \text{pOH} = 14
]

This equation comes from the water ionization constant at 25°C (Kw = 1 × 10⁻¹⁴).
So, if you already know the pH, you can easily calculate the pOH:

[
\text{pOH} = 14 - \text{pH}
]

Example: How to Calculate pOH from pH

Let’s say you have a solution with a pH of 5.6.

[
\text{pOH} = 14 - 5.6 = 8.4
]

That means the solution’s pOH is 8.4, indicating it’s slightly acidic.

Why This Calculation Matters

Knowing how to convert between pH and pOH allows scientists, educators, and industry professionals to:

  • Analyze chemical equilibria

  • Monitor water treatment systems

  • Optimize environmental testing

  • Ensure safe food and pharmaceutical production

Calculate Instantly with PHCalc.com

At PHCalc.com, you can instantly compute pH, pOH, hydrogen ion concentration, and hydroxide ion concentration using our accurate online pH–pOH calculator. Simply enter your known value, and our tool will provide all related parameters within seconds.

Whether you’re performing classroom experiments or professional chemical analysis, PHCalc.com simplifies your calculations and saves valuable time.

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  • Secondary keywords: pH calculator, pOH calculator, chemistry formula, acid-base calculation, online chemistry tools

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ProfessionalpHCalculator

 It looks like I wasn’t able to open your website directly, but that’s fine — I can still write a professional business article tailored for your site   PHCalc.com , using your target keyword   “ how to calculate pOH from pH. ” Here’s a polished, SEO-optimized article draft: How to Calculate pOH from pH: A Simple Guide for Students and Professionals Understanding the relationship between  pH  and  pOH  is essential in chemistry, biology, and environmental science. Whether you’re a student working through acid–base problems or a lab technician analyzing water quality, knowing  how to calculate pOH from pH  helps you determine the balance between acidic and basic solutions quickly and accurately. What Are pH and pOH? pH  measures the concentration of hydrogen ions ( H⁺ ) in a solution. Low pH (<7) means the solution is  acidic . High pH (>7) means it’s  basic . pH = 7 is  neutral , like pure water. pOH  measures t...
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