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    jlpini's Avatar
    jlpini Posts: 1, Reputation: 1
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    #1

    Nov 16, 2005, 08:42 PM
    Science project
    Explain why salt water and sugar water have a lower melting point than water.
    joseph2000's Avatar
    joseph2000 Posts: 12, Reputation: 1
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    #2

    Nov 20, 2005, 10:24 PM
    why lower mp
    This is the same reason why sea water and sugar solution have higher bp than pure water. If the solute is non-volatile there is a greater intramolecular attraction between solute and solvent. Thus it is quite more difficult to melt impure ice. Generally the formula for the change in mp for water is:

    delta Mp = fpc x molality where fpc is knows as cryoscopic constant
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