In the north during this season, when preparing ice brine at -15℃, what density should it have?

Ice salt water refers to a mixture in which salt (usually table salt, namely sodium chloride NaCl) is added to water to lower its freezing point. The freezing point of saltwater decreases as the concentration of salt in it increases. When preparing saline with a specific freezing point, it is necessary to determine the proportions based on the phase diagram of the saline. Generally, the concentration of ice saline can be determined by referring to the phase diagram of sodium chloride solutions. In this phase diagram, the freezing points at different solution concentrations can be found. For a freezing point of -15°C, the concentration of the saltwater you need to prepare must be higher than the equilibrium solubility at that temperature. To specifically prepare an ice-saltwater solution at -15°C, reference can be made to relevant graphs or tables showing the freezing point depression of solutions. According to standard information, preparing a sodium chloride solution with a freezing point of -15°C requires approximately 23.3% (by mass) sodium chloride, which means adding about 30.4 grams of pure table salt per 100 grams of water. This yields a saltwater solution with a mass concentration of approximately 23.3%. It should be noted that accurate measuring tools are best used to determine the amounts of salt and water when preparing the mixture. Additionally, since the ambient temperature is -5°C, it may be necessary to adjust the concentration slightly to ensure that the saltwater mixture does not freeze as a result of fluctuations in temperature. Be sure to pay attention to safety during the operation, and use appropriate containers and protective measures. If precise formulation is required, please refer to the latest chemical data or conduct experiments to determine the optimal formula. .