MadSci Network: Chemistry

Re: Why does grease does not disolve in water?

Date: Fri Mar 13 12:34:38 1998
Posted By: Richard Stein, Professor of Chemistry, Natural Sciences, Germanna Community College
Area of science: Chemistry
ID: 889782782.Ch

Thibaut -

Grease doesn't dissolve readily in water due to the difference
in polarity between the water, a polar solvent, and the
grease, a non-polar solute.  Generally speaking, the rule
of thumb is "like dissolves like" - that is, polar solvents
will dissolve polar solutes and non-polar solvents dissolve
non-polar solutes.  In polar dissolution, it is mainly a
matter of charge "insulation" of the ionic solute by
the polar water molecule.  In non-polar dissolution the
main forces are Van der Waals forces - weak inductive
forces between large covalent, non-polar molecules.

As for your question about the volume of NaOH.
You need to know the density of the sodium 
hydroxide to calculate the volume required.
Try the Handbook of Chemistry or the Handbook or
Chemistry and Physics.  YOu might also try some
of the online chemical databases.

Check out the website:

for a list of chemical databases.

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