GOB Chemistry
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Lactic acid partially dissociates according to this following equation: CH3CH(OH)COOH(aq) ⇌ H+(aq) + CH3CH(OH)COO–(aq). A solution is formed by dissolving 1.50 mol of lactic acid in 1.00 kg water, where 1.0% of lactic acid dissociates to ions. Calculate the freezing point of the solution, given that Kf for water is 1.86 ºC/m.
If an aqueous solution of CO(NH2)2 freezes at –4.02°C, how many moles of CO(NH2)2 are present in 131 g of water? (Kf water = 1.86 °C•kg/mol)
A compound extracted from tobacco leaves known as nicotine is a liquid and is completely miscible with water at temperatures below 60°C. Calculate the molality of nicotine (a covalent substance) in an aqueous solution that starts to freeze at –0.340°C. The Kf of water is 1.86°C•m–1.