How do I calculate the Molality of a water solution?
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Answer:
For this question, I would use the freezing point depression equation: ΔTf = -(i)(kf)(m) where, ΔTf = change in temperature i = 1 (in this case - see Van Holf Factor) kf = is a given value that's normally found in a table in your textbook = 1.86 for water m = mol solute/ kg solvent(H2O) = molality So, water normally freezes at 0 °C... (-9.3-0) = -(1)(1.86)(m) m = 5 mol solute/ kgH2O
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Other answers
For this question, I would use the freezing point depression equation: ΔTf = -(i)(kf)(m) where, ΔTf = change in temperature i = 1 (in this case - see Van Holf Factor) kf = is a given value that's normally found in a table in your textbook = 1.86 for water m = mol solute/ kg solvent(H2O) = molality So, water normally freezes at 0 °C... (-9.3-0) = -(1)(1.86)(m) m = 5 mol solute/ kgH2O
Shackel
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