what is elevation in boiling point and depression in freezing point?
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13.9: Freezing Point Depression and Boiling Point Elevation: Making Water Freeze Colder and Boil Hotter
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Freezing point of depression is a colligative property of solution. It is observed when solute is added to a solvent. Freezing point of pure solvent is greater than that of solutions. Depression of freezing point varies proportionally with the molality of the solute.
D Tf = Tf (solvent) – Tf (solution)
=i × kf × m
Where D Tf expresses the freezing point of depression, Tf (solution) expresses the freezing point of solution, Tf (solvent) expresses the freezing point of solvent and Kf expresses the freezing point depression constant, m is the molality of the solution and i is the van't Hoff factor. For NaCl, i = 2, for CaCl2= 3.
This phenomenon can be applied to lower the freezing point of road ice by adding sodium chloride salt. It causes to melt ice at lower temperature. CaCl2 is more effective than NaCl because of generating more ions than NaCl.
When a non-volatile solute is mixed with a pure solvent, then the boiling point of the solution increases than the pure solvent. This phenomenon is known as elevation of boiling point. Generally salts are added with the solvent.
D Tb=i × kb × m
Where ΔTb expresses the elevation of boiling point and Kb is the ebullioscopic constant. It depends on the nature of the solvent. M is the molality of the solution and is Van't Hoff factor.
MARK AS BRAINLIEST DEAR
Freezing point of depression is a colligative property of solution. It is observed when solute is added to a solvent. Freezing point of pure solvent is greater than that of solutions. Depression of freezing point varies proportionally with the molality of the solute.
D Tf = Tf (solvent) – Tf (solution)
=i × kf × m
Where D Tf expresses the freezing point of depression, Tf (solution) expresses the freezing point of solution, Tf (solvent) expresses the freezing point of solvent and Kf expresses the freezing point depression constant, m is the molality of the solution and i is the van't Hoff factor. For NaCl, i = 2, for CaCl2= 3.
This phenomenon can be applied to lower the freezing point of road ice by adding sodium chloride salt. It causes to melt ice at lower temperature. CaCl2 is more effective than NaCl because of generating more ions than NaCl.
When a non-volatile solute is mixed with a pure solvent, then the boiling point of the solution increases than the pure solvent. This phenomenon is known as elevation of boiling point. Generally salts are added with the solvent.
D Tb=i × kb × m
Where ΔTb expresses the elevation of boiling point and Kb is the ebullioscopic constant. It depends on the nature of the solvent. M is the molality of the solution and is Van't Hoff factor.
MARK AS BRAINLIEST DEAR
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