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GCSE Chemistry
3. Quantitative chemistry
3.4 Using concentrations of solutions in mol/dm³
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What is measured in grams (g)?
Mass
What is the formula for molar concentration?
Concentration = moles/volume
The formula for molar concentration is
c
o
n
c
e
n
t
r
a
t
i
o
n
=
concentration =
co
n
ce
n
t
r
a
t
i
o
n
=
n
u
m
b
e
r
o
f
m
o
l
e
s
v
o
l
u
m
e
(
d
m
3
)
\frac{number\ of\ moles}{volume\ (dm^{3})}
v
o
l
u
m
e
(
d
m
3
)
n
u
mb
er
o
f
m
o
l
es
, where volume is measured in dm³
What is the SI unit for the amount of substance?
Mole
Molar concentration indicates the number of moles of solute in one liter of solution.
True
A mole contains the same number of particles as there are atoms in 12 grams of
carbon-12
.
True
Molar concentration is expressed in moles per cubic decimeter (mol/dm³).
True
What is the relationship between moles, mass, and number of particles?
Moles relate to mass and particles
How many grams of carbon-12 are used to define a mole?
12 grams
The
mole
represents a specific number of particles, regardless of the substance.
True
Molar concentration is expressed in units of moles per cubic
decimeter
What does the molar concentration formula measure?
Amount of solute
A solution containing 0.5 moles of NaCl in 2 dm³ of water has a concentration of
0.25
mol/dm³
A 1.5 dm³ solution with a molar concentration of 0.2 mol/dm³ contains
0.3
moles of solute.
The formula for molar concentration is
concentration
To calculate the volume of a solution, you divide the number of moles by the
molar concentration
.
True
The
mole
is the unit for the amount of substance.
True
Match the quantity with its definition:
Moles ↔️ Unit for amount of substance
Mass ↔️ Amount of substance in grams
Number of particles ↔️ Atoms, molecules, or ions
If 0.5 moles of NaCl are dissolved in 2 dm³ of solution, the molar concentration is
0.25
mol/dm³.
True
The concentration of a solution is defined as the number of
moles
of solute per volume of solution.
To calculate the number of moles, you multiply the concentration by the
volume
.
The formula to calculate moles from molar concentration and volume is
moles = concentration × volume
.
True
Match the quantity with its unit:
Volume ↔️ dm³
Moles ↔️ mol
Concentration ↔️ mol/dm³
A molar concentration of 0.25 mol/dm³ is equivalent to
250,000
ppm.
To convert mol/dm³ to g/dm³, you multiply by the
molar mass
of the substance.
True
A solution with 14.61 g/dm³ of NaCl is equivalent to 250,000 ppm.
True
What is the molar mass of NaCl?
58.44 g/mol
To dilute the HCl solution to 0.1 mol/dm³, 400 cm³ of
water
should be added.
The volume in the molar concentration formula must be in
cubic decimeters
(dm³).
True
The concentration of a solution is always expressed in moles per cubic meter.
False
The number of moles in a solution can only be calculated if the volume is in liters.
False
What is the formula for calculating the number of moles from molar concentration and volume?
n
=
n =
n
=
C
×
V
C \times V
C
×
V
What is the formula for calculating the volume of a solution given the number of moles and concentration?
V
=
V =
V
=
n
C
\frac{n}{C}
C
n
The mole is defined as the amount of substance that contains the same number of particles as there are atoms in 12 grams of
carbon-12
What is molar concentration also known as?
Molarity
What do you divide the number of moles by to calculate molar concentration?
Volume in dm³
Molar concentration is also known as
molarity
.
True
What is the number of moles in a 2.5 dm³ solution with a concentration of 0.3 mol/dm³?
0.75 mol
The formula to calculate volume from moles and concentration is
v
o
l
u
m
e
=
volume =
v
o
l
u
m
e
=
m
o
l
e
s
c
o
n
c
e
n
t
r
a
t
i
o
n
\frac{moles}{concentration}
co
n
ce
n
t
r
a
t
i
o
n
m
o
l
es
, where the volume is in dm³.
To convert molar concentration from mol/dm³ to g/dm³, you multiply by the
molar mass
.
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