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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
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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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Primary keyword: how to calculate pOH from pH
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