Sodium Hydroxide Concentration Calculator
Sodium Hydroxide Concentration Calculator: calculate ρ with consistent units and explicit assumptions.
Inputs
wt%
g/mol
Results
- Concentration
- 12 wt%
- Density
- 1.1309 kg/L
- Mass concentration
- 135.708 g/L
- Molar concentration
- 3.3927 mol/L
- Reference temperature
- 20 °C
⚠ Approximate linear interpolation between sparse reference points only; no extrapolation. Not suitable for specification certification.
Formula
ρ = ρ₁ + (ρ₂−ρ₁) × (wt%−w₁)/(w₂−w₁)
g/L = 10 × density (kg/L) × wt%; mol/L = g/L / molecular weight
Assumptions & limits
- Mass fractions are wt%, not volume%. Components are conserved; no reaction, evaporation or precipitation.
- Planning calculation only: verify assays, solubility, heat release and handling with a qualified chemist.
- Binary NaOH–water only at 20 °C. Range 1–40 wt%; no temperature compensation.
- Source: https://amyd.quimica.unam.mx/pluginfile.php/16463/mod_resource/content/0/LQG-I%20--%20Tablas%20de%20densidades%20y%20solubilidades.pdf
- Anhydrous analyte basis, not hydrate charge mass. Density alone cannot identify multiple solutes.
- Sparse alcohol tables are planning estimates; measured density or certified alcoholometry is required for accurate strength.
Worked example
For the example inputs: Concentration = 12 wt%; Density = 1.1309 kg/L; Mass concentration = 135.708 g/L.
ρ = ρ₁ + (ρ₂−ρ₁) × (wt%−w₁)/(w₂−w₁)