Final answer:
To calculate the percentage of sodium chloride that will crystallize out when its saturated solution is cooled from 95 °C to 5 °C, compare the mass of the solution at both temperatures and calculate the difference. Use the formula (mass of solute crystallized / initial mass of solution) × 100% to find the percentage. It is estimated to be 3.9%.
Step-by-step explanation:
The percentage of sodium chloride that will crystallize out when its saturated solution at 95 °C is cooled to 5 °C can be determined by comparing the masses of the solution at both temperatures.
At 95 °C, the mass of the sodium chloride solution is 89.20 g, and at 5 °C, the mass is 92.68 g. The difference in mass between the two temperatures is 92.68 g - 89.20 g = 3.48 g. This difference in mass represents the amount of water that has crystallized out as ice.
To find the percentage of sodium chloride that has crystallized out, we can use the formula:
Percentage = (mass of solute crystallized / initial mass of solution) × 100%
Using the given values, the percentage of sodium chloride that has crystallized out would be (3.48 g / 89.20 g) × 100% = 3.9%.