Plot a phase diagram of NaCl solution ,the minimum depression is 23 degrees celcious at concentration 5mol/dm-3. (I)concentration of NaCl(mol/dm-3) 0,6 ;1,2;2,2;3,5 freezing point depression (degrees celcious 2,0;4,0;8,0 ;14,0
To plot a phase diagram for a NaCl solution, we need to use the concept of freezing point depression. Freezing point depression is the decrease in the freezing point of a solvent caused by the presence of a solute.
Here's how you can plot the phase diagram for the NaCl solution:
Step 1: Create a graph with the concentration of NaCl (mol/dm³) on the x-axis and the freezing point depression (ΔTf) in degrees Celsius on the y-axis.
Step 2: Mark the data points given in the problem statement on the graph. You have the following data:
- Concentration of NaCl (mol/dm³): 0, 6, 12, 22, 35
- Freezing point depression (ΔTf) in degrees Celsius: 2, 4, 8, 14
Step 3: Plot the data points on the graph. For example, when the concentration of NaCl is 0 mol/dm³, the freezing point depression is 2°C. Similarly, when the concentration is 6 mol/dm³, the freezing point depression is 4°C, and so on.
Step 4: Connect the plotted points with a smooth curve. This curve represents the phase diagram for NaCl solution.
Step 5: Label the axes as "Concentration of NaCl (mol/dm³)" for the x-axis and "Freezing Point Depression (ΔTf) in °C" for the y-axis.
Step 6: Optionally, you can add a title to the graph, such as "Phase Diagram of NaCl Solution."
Your final phase diagram should have a curve connecting the data points, illustrating how the freezing point depression varies with the concentration of NaCl. The freezing point depression increases as the NaCl concentration increases.