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colligative property
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a physical property of a solution that depends on the number, but not the identity, of the dissolved solute particles
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freezing point depression
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the difference in temperature between a solution’s freezing point and the freezing point of its pure solvent
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molar mass
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the mass of one mole of a substance, also molecular weight g/mole
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g/mole
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divide the mass of a substance by the number of moles contained in that mass of substance
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freezing point depression equation
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^T=mKf or ^T=(moles solute/kg solvent)Kf
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^T of depression formula
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the number of degrees Celsius the freezing point of a solution is lowered relative to the freezing point of the pure solvent
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m of depression formula
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molality
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molality
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concentration of a solution calculated by (mole solute)/(1 kg solvent)
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Kf of depression formula
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freezing point depression constant that depends on the solvent
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freezing point depression constant (Kf)
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kg solvent * °C/mol solute
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freezing point depression is _________ proportional to the number of moles of solute
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directly
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t-butyl alcohol
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Tert-butanol
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Why is t-butanol used as a solvent
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its freezing point is near room temperature and easily observed with an ice bath
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Can tap water be used to determine Kf for t-butanol? Why or why not?
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