Which parameter does osmometry primarily measure?

Which parameter does osmometry primarily measure?

• A. pH
• B. Temperature
• C. Chloride concentration
• D. Osmolality

Answer: (D)

The main concept here is that osmometry measures osmolality. Osmolality is the concentration of osmotically active particles in a solution, expressed as milliosmoles per kilogram of solvent. An osmometer typically determines this by assessing freezing point depression (or vapor pressure lowering) caused by dissolved particles and then converting that measurement into osmolality. This is different from pH, which gauges hydrogen ion activity; from temperature, which reflects thermal energy; and from chloride concentration, which is a specific ion level. So the parameter assessed by osmometry is osmolality.

The main concept here is that osmometry measures osmolality. Osmolality is the concentration of osmotically active particles in a solution, expressed as milliosmoles per kilogram of solvent. An osmometer typically determines this by assessing freezing point depression (or vapor pressure lowering) caused by dissolved particles and then converting that measurement into osmolality. This is different from pH, which gauges hydrogen ion activity; from temperature, which reflects thermal energy; and from chloride concentration, which is a specific ion level. So the parameter assessed by osmometry is osmolality.