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Chemistry:Freezing Points

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The freezing point lowering of a saturated aqueous solution of NaCl is 17 Celsius. Would spreading salt on the icy sidewalks be beneficial when the temperature outside is -8 Fahrenheit? Explain.

  • Chemistry:Freezing Points - ,

    What's your main problem with this? Is it not obvious that if NaCl will lower the f.p. by 17 C and the T is -8 then ....... What is the f.p. of pure H2O?

  • Chemistry:Freezing Points - ,

    I'm not sure as to whether or not spreading salt on sidewalks would be beneficial, considering the outside temperature. The freezing point of pure H2O is 0 °C or 32 °F. But Im not sure what that would infer?

  • Chemistry:Freezing Points - ,

    The freezing point is zero C normally. Spreading (or spraying) saturated NaCl solution CAN lower it by 17 degrees C according to the problem. The temperature is only -8 C, therefore, the ice would melt. In fact it would melt with an outside temperature of -16 C but it would not melt the ice if the outside temperature were -17 or lower. Anything higher than -17, yes.

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