pH calculation from calcium hydroxide (Ca(OH)₂)

Calcium hydroxide is a strong base that dissociates completely in water:

Ca(OH) 2 \to Ca 2+ + 2 OH -

Given is a net ion charge of:

0.0270 mol/L

Since each unit of Ca(OH)₂ provides two OH⁻ ions, the result is:

[OH -] = 0.0270 mol/L

From this, we calculate the pOH value:

pOH = - \log (0.0270) \approx 1.57

And finally:

pH = 14 - pOH \approx 12.43

Ergebnis: Die Lösung hat einen pH-Wert von ungefähr 12.43.

Quelle: Atkins & de Paula – Physical Chemistry, 12th Ed.

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Details: Written by: Helmer Borgmann; ID: 719; Parent Category: Technology; Category: Analysis; Also available:; Hits: 13

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