What laboratory property or measurement is Beckman's apparatus used to determine_______________?
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Answer: B. depression in freezing point
Explanation
Beckmann apparatus is designed to measure freezing point depression with high precision. It features a special thermometer that detects tiny temperature changes in solutions. This measurement helps determine the molar mass of nonvolatile solute substances accurately. Freezing point depression is a colligative property dependent on solute concentration. Beckmann thermometer can read temperature variations as small as one-thousandth of a degree. Solutions freeze at lower temperatures than pure solvents due to disrupted crystal lattices.
Physical chemistry laboratories use freezing point depression to calculate unknown molecular weights. Colligative properties are vital for understanding antifreeze solutions in winter vehicles. Accurate temperature measurement instruments are essential for precise thermodynamic experiments. Boiling point elevation is measured using alternative setups like Landsberger apparatus. Lowering of vapour pressure is determined through static or dynamic gas-liquid methods. Lowering of osmotic pressure is measured using specialized osmometer membrane devices.
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