September 24, 2010
CSI: Chemistry 20
Solution Chemistry
A solution is defined as:
a homogeneous mixture of substances
with at least one solute and one solvent.
September 24, 2010
A solvent is defined as:
a substance in which a solute is dissolved
to form a solution.
By far, the most common
solvent is: water
Another liquid solvent is:
turpentine
A gas solvent is: nitrogen in air
A solid solvent is: copper in
brass
A solute is defined as:
a substance that is dissolved in a solvent.
September 24, 2010
In aqueous solutions, solutes can be
classified as
Electrolyte: Solute whose solution
conducts electricity.
Non-electrolyte: Solute whose solution
does not conduct electricity.
Classifying compounds:
Electrolyte:
NaCl(aq) soluble ionic compound
KOH(aq) bases
HNO3(aq)
acids
Non-electrolyte
C2H5OH(aq)
soluble molecular compound
September 24, 2010
Empirical classification:
Red Litmus
Acid:
Blue Litmus
R
R
Base:
B
B
Neutral:
R
B
Diagnostic tests:
A diagnostic test is a specific lab
procedure that can be used to
determine the presence (or
absence) of a particular substance,
or class of substances.
September 24, 2010
Diagnostic test to classify
a solution as electrolyte or
non-electrolyte:
Conductivity apparatus
Homework:
Page 195 - 196
Questions:
1, 2, 4, 5, 6, 7, 11 a-c