Organic Freeze
Organic Freeze
The organic compound called aluminon is used as a reagent to test for the presence of the aluminum ion in ....
The organic compound called aluminon is used as a reagent to test for the presence of the aluminum ion in aqueous solution. A solution of 4.00 g of aluminon in 80.0 g of water freezes at -0.197°C. What is the molar mass of aluminon?
The freezing point depression equation is:
dT = Kf x molality, where "d" means delta (change).
The freezing point depression constant, Kf, for water is 1.86 C/molal
dT = Kf x molality
molality = dT / Kf = 0.197 C / 1.86 C/molal = 0.106 molal
molality = mol solute / kg solvent
mol solute = molality x kg solvent
mol solute = 0.106 mol/kg x 0.0800 kg = 0.00848 mol
molar mass = grams/mol = 4.00 g / 0.00848 mol = 472 g/mol.
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