Concentration The amount of a specific substance in a known volume of solution Concentrated Solutions The amount of substance dissolved in solution is very high It is difficult to dissolve more substance into solution ID: 631977
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Slide1
Molar ConcentrationSlide2
Knowing the concentration of a solution provides a way to find how much of a particular substance exists in a given volume of solutionSlide3
Concentration
The amount of a specific substance in a known volume of solutionSlide4
Concentrated Solutions
The amount of substance dissolved in solution is very high
It is difficult to dissolve more substance into solutionSlide5
Dilute Solutions
The solution has a relatively low concentration
Very little substance dissolved in the solutionSlide6
Saturated Solution
Maximum possible concentration of solution
Often diluted to create lower concentration solutionsSlide7
Supersaturates solution
Heated up to increase solute solubility and then carefully cooled!
i.e.
Jello
! Slide8
Molar Concentration
aka MOLARITY
Molar concentration is the number of moles of the substance contained in 1L of solution
(Molar) Concentration = mol / L
Number of Moles
Volume of Solution
C =
n
/ VSlide9
Units are ALWAYS important
The unit symbol for mol/L is M
M is stated as Molar
Molar concentration is denoted as [...
]
mol/L = M = [ ] =
molaritySlide10
Example 1:
If a 1.0L solution contains 2.5mol of
NaCl
, what is the molar concentration? Express this value in 4 different ways.
Slide11
Example 2:
What mass of
NaOH
is contained in 3.50L of 0.200M
NaOH
?
Remember M = mol/LSlide12
Example 3:
What is the
molarity
of pure
sulphuric
acid, H2SO4, having a density of 1.839
g/mL?
Hint: use the molar mass and the density
mol
/L=Slide13
Example 4:
What is the molarity of the CaCl
2
in a solution made by dissolving and diluting 15.00g of
CaCl
2
to 500.0mL?