Save
Edexcel A-Level Chemistry
Core Practicals
CP2 Preparation of a Standard Solution and Titration
Save
Share
Learn
Content
Leaderboard
Share
Learn
Cards (38)
What is a standard solution?
Solution with known concentration
The exact concentration of the solute in a standard solution must be accurately
determined
A standard solution must maintain its concentration over time and under standard storage
conditions
.
What is the formula to calculate the required mass of a solute for a standard solution?
M
a
s
s
=
Mass =
M
a
ss
=
C
o
n
c
e
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
s
s
Concentration × Volume × Molar Mass
C
o
n
ce
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
ss
Steps to calculate the required mass of a solute for a standard solution
1️⃣ Determine the desired concentration
2️⃣ Identify the target volume
3️⃣ Find the molar mass of the solute
4️⃣ Use the formula to calculate the mass
To prepare 250 mL of a 0.1 mol/L NaCl standard solution, the molar mass of NaCl is
58.44
g/mol.
How many grams of NaCl are needed to prepare 250 mL of a 0.1 mol/L solution?
1.461 g
To prepare a standard solution, you should weigh out the solute and dissolve it in
distilled water
.
Steps to prepare a standard solution in a volumetric flask
1️⃣ Weigh out the solute
2️⃣ Transfer the solute to the flask
3️⃣ Add water until two-thirds full
4️⃣ Swirl to dissolve the solute
5️⃣ Fill to the calibration mark
6️⃣ Mix thoroughly
In the example given, 1.461 g of NaCl is used to prepare a standard solution in a
250
mL volumetric flask.
What is the formula to calculate the required mass of solute?
M
a
s
s
=
Mass =
M
a
ss
=
C
o
n
c
e
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
s
s
Concentration × Volume × Molar Mass
C
o
n
ce
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
ss
The desired concentration in the formula is measured in
mol/L
What unit is used to measure the target volume in the formula?
Liters
The molar mass of the solute is measured in
g/mol
.
Steps to calculate the required mass of solute
1️⃣ Determine the desired concentration
2️⃣ Identify the target volume
3️⃣ Find the molar mass of the solute
4️⃣ Calculate the mass using the formula
To prepare 250 mL of 0.1 mol/L NaCl, the required mass is
1.461 g
What equipment is needed to weigh out the solute accurately?
Balance
Match the step with the equipment needed to dissolve the solute in a volumetric flask:
Weigh out solute ↔️ Balance
Transfer solute ↔️ Volumetric flask, Funnel
Add distilled water ↔️ Distilled water bottle
Fill to calibration mark ↔️ Dropper
When dissolving solute in a volumetric flask, it should be filled to two-thirds with
distilled water
first.
When filling a volumetric flask to the calibration mark, use a
dropper
Steps to perform a titration
1️⃣ Prepare a standard solution
2️⃣ Set up the titration apparatus
3️⃣ Add indicator
4️⃣ Titrate slowly
5️⃣ Monitor the end point
6️⃣ Record burette readings
7️⃣ Repeat the titration
What is a standard solution defined as?
A solution with known concentration
A standard solution must be made from a solute of high
purity
A standard solution is a solution with a known
concentration
A standard solution maintains its
concentration
over time
What does high purity of the solute in a standard solution ensure?
Accurate concentration
A 0.1 mol/L NaCl solution is an example of a
standard
solution.
What formula is used to calculate the required mass of a solute for a standard solution?
M
a
s
s
=
Mass =
M
a
ss
=
C
o
n
c
e
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
s
s
Concentration × Volume × Molar Mass
C
o
n
ce
n
t
r
a
t
i
o
n
×
V
o
l
u
m
e
×
M
o
l
a
r
M
a
ss
Steps to calculate the required mass of a solute
1️⃣ Determine the concentration of the solution
2️⃣ Identify the desired volume of the solution
3️⃣ Find the molar mass of the solute
4️⃣ Calculate the required mass using the formula
What is the required mass of NaCl to prepare 250 mL of a 0.1 mol/L solution?
1.461 g
To prepare a standard solution, the solute must be dissolved in a volumetric
flask
.
Steps to dissolve a solute in a volumetric flask
1️⃣ Weigh the required amount of solute
2️⃣ Transfer the solute into the volumetric flask
3️⃣ Add distilled water to two-thirds full
4️⃣ Swirl the flask to dissolve the solute
5️⃣ Fill to the calibration mark with distilled water
6️⃣ Invert the flask to mix thoroughly
What volume of distilled water is needed to prepare a 0.1 mol/L NaCl solution in a 250 mL volumetric flask?
250 mL
The meniscus in a volumetric flask must align with the
calibration mark
at eye level
A titration is performed to determine the concentration of an unknown
analyte
.
Steps to perform a titration
1️⃣ Prepare the standard solution
2️⃣ Set up the apparatus with analyte in a conical flask
3️⃣ Add a suitable indicator
4️⃣ Titrate slowly, swirling continuously
5️⃣ Observe the end point
6️⃣ Record burette readings
7️⃣ Calculate analyte concentration
How is the volume of titrant used in a titration calculated?
Final reading - Initial reading
What is the average titrant volume in the example provided?
22.53 mL
See similar decks
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
121 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
113 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
113 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
113 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
71 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
121 cards
CP2 Preparation of a Standard Solution and Titration
Edexcel A-Level Chemistry > Core Practicals
258 cards
Core Practicals
Edexcel A-Level Chemistry
879 cards
Edexcel A-Level Chemistry
8012 cards
CP10 Preparation of a Pure Organic Solid
Edexcel A-Level Chemistry > Core Practicals
37 cards
CP9 Chromatography
Edexcel A-Level Chemistry > Core Practicals
101 cards
Edexcel A-Level Geography
1080 cards
Edexcel A-Level Physics
3500 cards
Edexcel A-Level Spanish
423 cards
AQA A-Level Chemistry
2987 cards
Edexcel A-Level Mathematics
1566 cards
CP8 Investigating Electrochemical Cells
Edexcel A-Level Chemistry > Core Practicals
118 cards
Edexcel A-Level English Language
949 cards
Edexcel A-Level Politics
2641 cards
CP7 Measuring Enthalpy Changes
Edexcel A-Level Chemistry > Core Practicals
146 cards
CP12 Investigating pH Changes
Edexcel A-Level Chemistry > Core Practicals
63 cards