elevation in boiling point practical.pptx
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This document discusses using boiling point elevation to determine molecular weight. It explains that adding a non-volatile solute to a solvent raises the boiling point. This is because the vapor pressure decreases, requiring more heat to reach the boiling point. The boiling point elevation, ΔTb, is directly proportional to the molal concentration of the solute. By measuring ΔTb and using the boiling point elevation constant, the molality and molecular weight of an unknown solute can be calculated. The procedure involves taking the boiling point of the pure solvent, adding a known amount of solute, and measuring the new boiling point to determine ΔTb.
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- 8. Result The molecular weight of solute is ____________ g/mole.