Freezing-Point - Using Freezing-Point Depression to Find Molecular Weight Abstract Biphenyl(C6H5)2 was used as the solute that was dissolved in the pure

Freezing-Point - Using Freezing-Point Depression to Find...

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Using Freezing-Point Depression to Find Molecular Weight Abstract: Biphenyl (C 6 H 5 ) 2 was used as the solute that was dissolved in the pure solvent, cyclohexane (C 6 H 12 ) to measure the freezing point depression ( Δ T ) and apply in the equation Δ T = K f ! m. Then, the molar mass was calculated to be 131.09 g/mol, which was 14.998% error when comparing with the accepted value (154.22 g/mol). Introduction: Molar mass of a known mass solute in a known mass solution can be calculated by measuring the difference in freezing temperature and then applying to the equation for freezing point depression, Δ T = K f ! m. According to the colligative property, a solution freezes at lower temperature than a pure solvent does. In this laboratory, the pure known mass solvent, cyclohexane (C 6 H 12 ) and the solution of cyclohexane and biphenyl will be measured the difference in freezing temperature ( Δ T). Then, applying this value into the equation for freezing point depression Δ T = K f !
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