How to use the hydroxide precipitation ph calculator
Find the pH at which a metal hydroxide starts to precipitate from its solubility product. Enter solubility product of hydroxide, metal ion concentration, hydroxide ions per formula unit in the fields above; the hydroxide concentration at precipitation, precipitation starts at ph are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “metal hydroxide precipitation pH”, “pH to precipitate hydroxide”, “Ksp hydroxide pH”, “calculate hydroxide precipitation ph”, “find hydroxide concentration at precipitation”.
Formula
Variables
- Ksp — Solubility product of hydroxide
- M — Metal ion concentration (M)
- n — Hydroxide ions per formula unit
Worked example
With solubility product of hydroxide = 2e-20, metal ion concentration = 0.01 M, hydroxide ions per formula unit = 2, the calculator gives hydroxide concentration at precipitation ≈ 1.4142 × 10⁻⁹ M; precipitation starts at ph ≈ 5.150515 pH.
Frequently asked questions
What is the hydroxide precipitation ph calculator used for?
Find the pH at which a metal hydroxide starts to precipitate from its solubility product. It helps with questions such as “metal hydroxide precipitation pH”, “pH to precipitate hydroxide”, “Ksp hydroxide pH”.
What is the formula for the hydroxide precipitation ph calculation?
Hydroxide concentration at precipitation (M) = (Ksp / M)^(1 / n). Precipitation starts at pH (pH) = 14+log10([Hydroxide concentration at precipitation]). Here Ksp is solubility product of hydroxide, M is metal ion concentration (M), n is hydroxide ions per formula unit.
What inputs do I need for the hydroxide precipitation ph calculator?
You need solubility product of hydroxide, metal ion concentration in M, hydroxide ions per formula unit. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the hydroxide precipitation ph calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the hydroxide precipitation ph result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.