please can someone help me? 1.What is the freezing point of a solution of 37.4 g

Question

please can someone help me?
1.What is the freezing point of a solution of 37.4 g of sodiumchloride dissolved in 1000 g of water? 2.Which type of membrane is more selective in terms of whatcan pass through, a dializying membrane or an osmoticmembrane? please can someone help me?
1.What is the freezing point of a solution of 37.4 g of sodiumchloride dissolved in 1000 g of water? 2.Which type of membrane is more selective in terms of whatcan pass through, a dializying membrane or an osmoticmembrane?

Explanation / Answer

1. I think this question is missing the freezing point constant ofwater, kf of water is1.86°C/molal Firstly, let's calculate the molality of the solution: Molal = Moles of NaCl / Kg solvent = [37.4 g NaCl / 58.44 g/mol ] /1 kg H2O = 0.640 mol/kg = 0.640 molal Then, use the formula Tf = kf x molalto calculate the change in temperature: Tf =1.86°C/molal x 0.640molal = 1.19°C Because adding the solute into a solvent will cause a depression inthe solvent's freezing point, the new freezing point of water willbe: T = (normal freezing point of water) - Tf =0.00°C -1.19°C = -1.19°C 2. Osmosis is the movement of water through an osmotic membrane.Osmotic membranes allow passage of only solvent molecules. Whiledialyzing membranes allow passage of ions and small molecules aswell as solvent. The transfer of these particles through a membraneis dialysis. Thus the answer for your question is osmosismembrane.

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