Strong Base pH Calculator

Calculate the pH of strong base solutions from concentration. Get instant pH values with detailed calculations for chemistry and laboratory work.

M

Molarity (mol/L) of the strong base solution

Number of hydroxide ions released per molecule

°C

Temperature affects water ionization constant

Results

pH

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pOH

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[OH⁻] Concentration

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[H⁺] Concentration

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Frequently Asked Questions

What is a strong base and how does it differ from a weak base?

A strong base completely dissociates in water, releasing all available OH⁻ ions. Examples include NaOH, KOH, and Ba(OH)₂. Unlike weak bases, strong bases don't require equilibrium calculations.

How do you calculate pH from a strong base concentration?

For strong bases: [OH⁻] = n × C (where n is stoichiometry and C is concentration), then pOH = -log[OH⁻], and pH = 14 - pOH at 25°C.

Why does temperature affect pH calculations?

Temperature changes the water ionization constant (Kw). At 25°C, Kw = 1×10⁻¹⁴, but it increases with temperature, affecting the pH + pOH = 14 relationship.

What does the stoichiometry number (n) represent?

The stoichiometry number indicates how many OH⁻ ions each molecule of base releases. For example, NaOH has n=1, while Ba(OH)₂ has n=2.

What pH range do strong bases typically have?

Strong bases typically have pH values above 7, often ranging from 10-14 depending on concentration. Higher concentrations result in higher pH values.

Can pH be greater than 14?

Yes, in very concentrated strong base solutions, pH can exceed 14. The pH scale isn't limited to 0-14, though this range covers most common aqueous solutions.

What's the relationship between pH and pOH?

At 25°C, pH + pOH = 14 (due to Kw = 1×10⁻¹⁴). For bases with high pH, the pOH will be correspondingly low, and vice versa.

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