For Solids in Liquids:
* g/100 g solvent: This is the most widely used unit, representing grams of solute dissolved in 100 grams of solvent at a specific temperature.
* g/mL solvent: This unit is also common, especially for solutions where the solvent is a liquid with a known density.
* mol/L: Represents the molar concentration (moles of solute per liter of solution) which is useful for understanding the chemical reactions and properties of the solution.
* ppm (parts per million): Used for extremely low solubilities, representing the number of parts of solute per million parts of solution.
For Gases in Liquids:
* mL gas/100 mL solvent: Represents the volume of gas dissolved in 100 mL of liquid at a specific temperature and pressure.
* atm: For gases, solubility can also be expressed as the partial pressure of the gas in the atmosphere above the liquid.
Important considerations:
* Temperature: Solubility curves are typically plotted against temperature, as temperature significantly impacts solubility.
* Pressure: For gases, solubility is highly dependent on pressure.
* Solvent: The specific solvent used affects solubility.
Example: A solubility curve for sodium chloride (NaCl) in water might use the unit g/100 g H2O on the y-axis and temperature (°C) on the x-axis.
Always pay attention to the specific context and the units provided on the axes of a solubility curve to understand the information it presents.
