PART B: The Freezing Point of an Unknown Ionic Solid – NaCl or KI Hello, I am currently working on a colligative properties lab report and I am not exactly sure what to do with certain data or how to use it.
“PART B: The Freezing Point of an Unknown Ionic Solid – NaCl or KI
Hello, I am currently working on a colligative properties lab report and I am not exactly sure what to do with certain data or how to use it.
1. Using the average normalized freezing points (emailed to you from your TA) of both Unknowns1 and 2, use Equation 1 to calculate the concentrations (in molality) of each unknown. The freezing point depression constant of water is 1.86 °C/m.
2. Use Equation 2 to convert each concentration from Step 1 to number of moles for Unknowns 1 and 2.3. Since the freezing point values in Step 1 were normalized to correspond to 2.0 g of unknown,determine the molecular weights of Unknowns 1 and 2 assuming a 2.0 g sample of each. ”
The ionic unknowns here are NaCl and KI. The normalized freezing points of unknown 1 is -1.8, and of unknown 2 is -7.7. I know that equation 1 is DTf=Kfmi, and that equation 2 is m=(mol solute)/(kg solvent). I am not exactly sure what to plug in where, and not very sure what to do for step 3. Help is very appreciated, thank you
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