science project

jlpini · #1 Nov 16, 2005, 06:42 PM

explain why salt water and sugar water have a lower melting point than water.

joseph2000 · Nov 20, 2005, 08:24 PM

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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