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Ch 6.3a Molarity | Donald Hirsh | YouTubeToText
YouTube Transcript: Ch 6.3a Molarity
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This content introduces molarity as a fundamental measure of solution concentration, defining solutions as homogeneous mixtures and outlining how to calculate molarity and perform dilution calculations.
so we're going to begin section 6.3 and
the topic of our uh this chapter is
molarity molarity is a measure of the
concentration of a solution so your
learning objectives for this section are
to be able to describe the fundamental
properties of solutions
calculate solution concentrations using
molarity and perform dilution
calculations using the dilution equation
in the preceding sections we focused on
the composition of pure substances
however mixtures that is samples that
contain two or more substances
physically combined or more commonly
encountered in nature than pure substances
substances
similar to a pure substance the relative
composition of a mixture plays an
important role in determining its properties
so here's a familiar solution sugar is
one of the many components in the
complex mixture known as coffee once all
the sugar dissolves and the coffee is
stirred we have a homogeneous mixture or
a solution
the higher the concentration of sugar
another example from foods is distilled
white vinegar so distilled white vinegar
is simply a solution of acetic acid in water
so Solutions occur frequently in nature and
and
um Solutions is is just another term for
a homogeneous mixture so homogeneous
mixture has a uniform composition and
properties throughout its entire volume
relative amount of a given uh the
relative amount of a given solution
so there's really two components to a
solution there's the solvent which I
will typically call just the major
component it's the component with a
concentration that is significantly
greater than that of all the other
components and then there's the solute
which is the component that is typically
present at a much lower concentration
um Solutions we often think of solutions
as being liquids but they can also be
solids or gases so for instance
stainless steel is a solid solution
where iron is a solvent that is it's the
major component and chromium is the
solute or minor component
solid Solutions of metals are often
called alloys
air is a um a gaseous solution where
nitrogen is the solvent and oxygen and
so molarity is a measure of the number
of moles of solute in one liter of the solution
solution
so molarity has units then of moles of
solute divided by liters of solution
it's a very useful concentration unit
here's an example a 355 milliliter soft
drink sample contains 0.133 mole of
sucrose or table sugar
what is the major concentration of
sucrose in the beverage
so to calculate we simply divide the
number of moles of sucrose
by the number of liters of solution
since we were given milliliters we have
to first convert milliliters to liters
using this conversion factor here and then
then divide
divide
0.133 mole by the volume in liters and
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