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AQA GCSE Chemistry
3. Quantitative chemistry
3.4 Using concentrations of solutions in mol/dm³
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Cards (67)
What does the concentration unit mol/dm³ represent?
Moles per cubic decimetre
What is the conversion factor between mol/dm³ and mol/L?
1 mol/dm³ = 1 mol/L
The most common unit of concentration is
mol/dm³
The relationship between concentration, moles, and volume is
Concentration = Moles / Volume
What is the most useful unit of concentration for quantitative chemistry calculations?
mol/dm³
What is the formula for calculating concentration in mol/dm³?
C
o
n
c
e
n
t
r
a
t
i
o
n
=
Concentration =
C
o
n
ce
n
t
r
a
t
i
o
n
=
M
o
l
e
s
V
o
l
u
m
e
\frac{Moles}{Volume}
V
o
l
u
m
e
M
o
l
es
Steps to calculate concentration using the formula Concentration = \frac{Moles}{Volume \, (dm^{3})}</latex>
1️⃣ Convert the volume to dm³ if necessary
2️⃣ Use the formula to find the concentration
The formula for calculating concentration is essential in stoichiometry.
True
Match the concentration unit with its definition:
mol/L ↔️ Moles per litre
g/L ↔️ Grams per litre
ppm ↔️ Parts per million
What is the concentration if 0.5 moles of NaCl are dissolved in 2 dm³ of water?
0.25 mol/dm³
How do you calculate volume if you know concentration and moles?
V
o
l
u
m
e
=
Volume =
V
o
l
u
m
e
=
M
o
l
e
s
C
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c
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t
r
a
t
i
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\frac{Moles}{Concentration}
C
o
n
ce
n
t
r
a
t
i
o
n
M
o
l
es
The volume in the moles formula must be in
dm³
.
True
What is the formula for calculating volume given moles and concentration?
V
o
l
u
m
e
=
Volume =
V
o
l
u
m
e
=
M
o
l
e
s
C
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n
c
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n
t
r
a
t
i
o
n
\frac{Moles}{Concentration}
C
o
n
ce
n
t
r
a
t
i
o
n
M
o
l
es
How do you convert a concentration in mol/dm³ to g/L?
C
o
n
c
e
n
t
r
a
t
i
o
n
(
g
/
L
)
=
Concentration (g / L) =
C
o
n
ce
n
t
r
a
t
i
o
n
(
g
/
L
)
=
C
o
n
c
e
n
t
r
a
t
i
o
n
(
m
o
l
/
d
m
3
)
×
M
o
l
a
r
M
a
s
s
(
g
/
m
o
l
)
Concentration (mol / dm^{3}) \times Molar Mass (g / mol)
C
o
n
ce
n
t
r
a
t
i
o
n
(
m
o
l
/
d
m
3
)
×
M
o
l
a
r
M
a
ss
(
g
/
m
o
l
)
What does mol/dm³ measure in a solution?
Amount of substance in moles per volume in dm³
What does the unit mol/dm³ measure?
Concentration
What is the definition of concentration in chemistry?
Amount of substance dissolved
The mol/dm³ unit is crucial in quantitative chemistry for precise calculations in
stoichiometry
.
True
To convert from mol/dm³ to g/L, you multiply by the
molar mass
of the substance.
True
The concentration unit mol/dm³ represents the number of moles of a substance dissolved in one cubic
decimetre
What is the volume of a cubic decimetre (dm³)?
1 L
What is the concentration if 0.5 moles of NaCl are dissolved in 2 dm³ of water?
0.25 mol/dm³
What does the concentration unit ppm stand for?
Parts per million
The formula for concentration in mol/dm³ is
C
o
n
c
e
n
t
r
a
t
i
o
n
=
Concentration =
C
o
n
ce
n
t
r
a
t
i
o
n
=
M
o
l
e
s
o
f
s
u
b
s
t
a
n
c
e
V
o
l
u
m
e
o
f
s
o
l
u
t
i
o
n
(
d
m
3
)
\frac{Moles \, of \, substance}{Volume \, of \, solution \, (dm³)}
V
o
l
u
m
e
o
f
so
l
u
t
i
o
n
(
d
m
3
)
M
o
l
es
o
f
s
u
b
s
t
an
ce
moles
If a 0.25 mol/dm³ solution has a volume of 2 dm³, the number of moles is 0.5 mol.
True
In the formula for calculating moles, concentration is measured in
mol/dm³
If you have a 0.25 mol/dm³ solution and the volume is 2 dm³, the moles are
0.5
mol.
Steps to calculate volume from moles and concentration
1️⃣ Identify the given values: Moles and Concentration
2️⃣ Rearrange the formula to solve for Volume
3️⃣ Plug in the values and calculate the Volume in dm³
The most common unit for concentration is
mol/dm³
.
True
The unit mol/dm³ is used in quantitative chemistry to link
substance
amount to solution volume.
True
Steps to calculate concentration using the formula Concentration = \frac{Moles}{Volume \, (dm^{3})}</latex>
1️⃣ Convert the volume to dm³ if necessary
2️⃣ Use the formula to find the concentration
The concentration formula is essential for stoichiometry and calculating reactant amounts in chemical reactions.
True
How many moles are in 2 dm³ of a 0.25 mol/dm³ solution?
0.5 mol
What is the formula to calculate volume from moles and concentration?
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}
C
o
n
ce
n
t
r
a
t
i
o
n
M
o
l
es
What is the unit for moles?
mol
The formula for concentration involving different units is
Concentration = \frac{Moles}{Volume \, (dm^{3})}</latex>
Steps to convert concentration from ppm to mol/dm³
1️⃣ Convert ppm to g/L
2️⃣ Use the formula:
C
o
n
c
e
n
t
r
a
t
i
o
n
(
m
o
l
/
d
m
3
)
=
Concentration (mol / dm^{3}) =
C
o
n
ce
n
t
r
a
t
i
o
n
(
m
o
l
/
d
m
3
)
=
C
o
n
c
e
n
t
r
a
t
i
o
n
(
g
/
L
)
M
o
l
a
r
M
a
s
s
(
g
/
m
o
l
)
\frac{Concentration (g / L)}{Molar Mass (g / mol)}
M
o
l
a
r
M
a
ss
(
g
/
m
o
l
)
C
o
n
ce
n
t
r
a
t
i
o
n
(
g
/
L
)
What does
C
2
C_{2}
C
2
represent in the dilution equation?
Final concentration
1 mol/dm³ is equal to 1 mol/L.
True
The
mol/dm³
unit is crucial for stoichiometry calculations.
True
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