Dissolve five heaping teaspoons of table salt in 450 g (450 ml) of water. Considering that the mass of salt in each

Dissolve five heaping teaspoons of table salt in 450 g (450 ml) of water. Considering that the mass of salt in each spoon is about 10 g, calculate the mass fraction of salt in the solution. Pour the resulting solution and tap water into two identical plastic bottles with a volume of 0.5 liters. Place the bottles in the fridge freezer. Take a look in the refrigerator after about an hour. Which liquid starts to freeze first? In which bottle will the contents turn to ice first? Make a detailed conclusion.

1) To calculate the mass fraction of salt in the solution, it is necessary to calculate the mass of dissolved salt, given that we took five teaspoons of table salt (with a slide), and the mass of salt in each spoon is about 10 g, that is, m (substance) = 5 ∙ 10 = 50 (g). Let us find the mass of the solution, knowing that the salt was dissolved in 450 g (450 ml) of water, m (solution) = 50 + 450 = 500 (g). The mass fraction of a substance in a solution is determined by the formula: ω (substance) = m (substance) / m (solution), we obtain ω (substance) = 50/500 = 0.1 or 10%.
Answer: 10%.
2) If you pour the resulting solution and tap water into two identical plastic bottles with a volume of 0.5 liters and place the bottles in the freezer of the refrigerator, then tap water will begin to freeze earlier and turn into ice earlier.
Conclusion: Salt water, due to impurities, has a higher density and a lower freezing point than fresh water.