Prepare a solution of NaCl by accurately weighing approximately 1.45g of NaCl into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all crystals dissolve. Prepare a solution of magnesium chloride by accurately weighing approximately 3.61 g of MgCl2٠6H20 into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all the crystals dissolve. 1. Calculate the molality of the NaCℓ and MgCℓ2.6H2O solutions. 2. Calculate the total mass of water (solvent) in kg: a) Mass of crystal water added (kg): b) Mass of water added (kg): c) Total mass of water added (kg): 3. Calculate the molality of MgCℓ2. All questions follow on from each other. Thanks very much.
Prepare a solution of NaCl by accurately weighing approximately 1.45g of NaCl into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all crystals dissolve. Prepare a solution of magnesium chloride by accurately weighing approximately 3.61 g of MgCl2٠6H20 into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all the crystals dissolve. 1. Calculate the molality of the NaCℓ and MgCℓ2.6H2O solutions. 2. Calculate the total mass of water (solvent) in kg: a) Mass of crystal water added (kg): b) Mass of water added (kg): c) Total mass of water added (kg): 3. Calculate the molality of MgCℓ2. All questions follow on from each other. Thanks very much.
Chapter2: Crystallization
Section: Chapter Questions
Problem 3Q
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Prepare a solution of NaCl by accurately weighing approximately 1.45g of NaCl into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all crystals dissolve.
Prepare a solution of magnesium chloride by accurately weighing approximately 3.61 g of MgCl2٠6H20 into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL
distilled water. Mix until all the crystals dissolve.
1. Calculate the molality of the NaCℓ and MgCℓ2.6H2O solutions.
2. Calculate the total mass of water (solvent) in kg:
- a) Mass of crystal water added (kg):
- b) Mass of water added (kg):
- c) Total mass of water added (kg):
3. Calculate the molality of MgCℓ2.
All questions follow on from each other. Thanks very much.
Transcribed Image Text:12
10
4
2
-2
H2O
-4
Time (s)
Na CI
Figure 2: Cooling curves for pure water, an
aqueous sodium chloride and an aqueous
magnesium chloride solution.
(5.) dwal
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