mmax = S(T) × meau / 100S: g of solute per 100 g d water; meau and mmax: g.
Use when: Only for a diagram expressed according to this convention.
Interpreting solubility diagrams
Plan for saturation and the possible presence of a solid deposit.
What is happening?
At a given temperature and pressure, solubility limits the quantity of a solute that can dissolve in a solvent. A saturated solution can coexist with an excess of solid.
The axis of the diagram specifies the convention: grams per 100 g of water, grams per liter of solution or molar concentration. These quantities are not interchangeable without conversion.
The formulas, with their conditions.
mprécipité = max(0, minitial − mdissous à Tfinal)Masses in the same unit.
Use when: Cooling at constant solvent quantity, without reaction or evaporation.
Where is this principle used?
Crystallization plant
Choose cooling to recover a solid.
Pharmaceutical and salt industry
Separate and purify dissolved products.
What to observe in the experiment
Keep the same mass of water and cool a saturated solution: compare the initial and final solubilities before estimating the deposition.
References and readings
This sheet explains the principles and their assumptions. Educational simulation can simplify the process; an industrial model requires suitable data and validation.
Have you understood the essentials?
Only one correct answer per question. Answer all three questions, then view the answer key.
Intu Lab · Understanding sheet · Kimba Christian