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WorksheetsDK014 Trial Practical Test- Skills
Total questions: 50
Worksheet time: 35mins
After completing an experiment, all material waste should be-
left at your table for the next class
taken home
disposed of according to your teacher's directions
dumped into the sink
What is the main purpose of acid-base titrations?
To test if reactants react.
To calculate the concentration of unknown analyte.
To calculate the concentration of known analyte.
To test quality of reactants.
What is the role of an indicator in a reaction?
To help reactants react successfully.
To bind to the analyte to form a products.
To show when the reaction has reached or past the equivalence point.
To provide a surface for the reaction to occur.
What is the white tile or white paper for in titration?
To help clearly see the color change
To protect the conical flask
To add extra height
To assist the reaction
What is the function of 25 mL pipette?
to measure liquid less than 25.00 mL
to measure 20.00 mL liquid
to measure exactly 25.00 mL of liquid
to measure any volume of liquid in between 5.00 mL to 25.00 mL
What is the name of this apparatus?
pipette
burette
pipette filler
pump
What should be done to the pipette before it can be used to measure the volume of a liquid?
the pipette should be rinsed with distill water only
the pipette should be rinsed with distill water and then rinse with the liquid to be measured.
the pipette should be rinsed with the liquid to be measured only
no need to rinsed with any solution, just start to measure the volume of a liquid.
How to fill in a solution into the burette?
place a funnel on top of the burette and pour in the solution.
pour directly the solution from a beaker into the burette
add the solution into the burette using a dropper
add the solution into the burette using a pipette
Name the apparatus above and its uses.
Pipette filler. To draw liquids into a pipette safely
Burette. To measure the volume of a liquid
Pipette. To measure out or transfer small quantities of liquid
Dropper. To transfer a liquid drop by drop
A __________ reaction is when an acid and a base are reacted together to produce water and a salt.
Neutralization
Volcanic
Decomposition
Single replacement
A(n) ___________ is a procedure in which a solution of known concentration is used to determine the concentration of an unknown solution.
experiment
titration
chemistry
reaction
The solution of known concentration is also referred to as the __________ solution.
perfect
concentrated
standard
dilute
The __________ of a titration occurs when you have added just enough of the one solution to completely react with the other solution.
endpoint
neutralization
base
acid
A(n) __________ is used to indicate the end of a titration.
pH
chemical
measurement
indicator
What is a titration?
when the moles of hydrogen ions is equal to the moles of hydroxide ions
adding a known amount of solution of known concentration to determine the concentration of an unknown
reaction in which an acid and a base react in an aqueous solution to produce a salt and water
the extent of ionization of an acid or base
What are the units for volume in a titration
cm3
dm3
g
mol
What allows us to know when the end point has been reached?
Bubbles
Feels warm
indicator changing color
Turns to a solid
It is defined as the moles of solute in one liter of
a solution.
molality
molarity
mole fraction
mass percent
What is the convenient technique use to carry out
quantitative studies of acid-base neutralization
reaction?
redox titration
equivalence point method
electrolysis
acid-base titration
25 ml is the same volume as
0.25 L
0.025 L
0.0025 L
What is this apparatus used for titration called?
Burette
Volumetric Pipette
Pipette filler
Volumetric flask
Which apparatus would you use to prepare a standard solution
Burette
Volumetric Pipette
Measuring Cylinder
Volumetric flask
Which solution would you place in a burette
Standard solution
Unknown concentration solution
Indicator
Which solution would you place in a volumetric flask
Standard solution
Unknown concentration solution
Indicator
How to remove air bubble in the burette?
no need to remove air bubbles
shake the burette vigorously until the air bubble disappear
tap the burette gently until the air bubble disappear
open the tap to flush out the air bubbles
During titration, when there are droplets of solution on the walls of the conical flask, you should .................
ignore as it won't affect the results
rinse the wall of the conical flask with solution in the burette
rinse the wall of the conical flask with deionised water
rinse the wall of the conical flask with tap water
During titration, you should swirl the conical flask constantly.
TRUE
FALSE
When should you stop a titration?
When you have added equal volumes
When the indicator changes colour
When you run out of solution
When the solution is no longer acidic
Step 1 of preparing a standard solution:___________
Weigh a primary standard accurately
Weigh a primary standard and round it to the nearest whole number
Weigh approximately 1g of primary standard
Weigh approximately 100g of primary standard
Step 2 of preparing a standard solution:___________
Dissolve the primary standard in a small amount of deionised or distilled water in a beaker.
Dissolve the primary standard in a small amount of deionised or distilled water in a volumetric flask.
Dissolve the primary standard in a large amount of deionised or distilled water in a beaker.
Dissolve the primary standard in a large amount of deionised or distilled water in a volumetric flask.
Step 3 of preparing a standard solution:___________
Transfer the solution and rinsings to a beaker
Transfer the solution and rinsings to a volumetric flask.
Transfer the solution to a volumetric flask.
Transfer the solution to a beaker.
Step 4 of preparing a standard solution:___________. Tick all that apply.
Make up to the graduation mark
Use a stopper
Invert the flask
Weigh the volumetric flask
What is the retort stand and clamp used for in the laboratory?
Heating objects
Holding objects
Melting objects
The pipette and pipette filler are used to measure a known volume of liquid.
False
True
Name the chemical placed in the burette during the titration.
Methyl orange indicator
Sodium hydroxide
Hydrochloric acid
Methyl orange is yellow in a base
True
False
What is an equivalence point?
It is the point when enough analyte has been added.
It is the point when the amount of added titrant is equal to the amount of analyte in the solution.
It is the point when the volume of titrant is equivalent the volume of analyte.
It is the point when the concentration of titrant added is equivalent to the volume of analyte.
Complete the following equation
Metal Carbonate + acid -->
Salt + hydrogen
Salt + water
Salt + carbon dioxide
Salt + carbon dioxide + water
What is the use of a standard solution?
A standard solution is used to determine the concentration (molarity) of the other substances such as solution in titration.
A standard solution is used to determine the volume of the other substances such as solution in titration.
A standard solution is used to determine the usability of the other substances such as solution in titration.
A standard solution is used to determine the chemical property of the other substances such as solution in titration.
What is the difference between end point and equivalence point?
End point is the point at which the indicator changes colour.
Equivalence point is the point at which exact reaction occurs between the two reagents according to stoichiometry.
End point is the point at which exact reaction occurs between the two reagents according to stoichiometry.
Equivalence point is the point the indicator changes colour.
Which eye position (level) is correct when taking a reading of a meniscus?
A
B
C
Name the lab apparatus in the picture.
Conical flask.
Volumetric flask.
Pipette.
Burette.
What precaution needs to be taken based on the image provided?
Position of the experimenter's finger.
Air bubble trapped in the burette tip.
From the video, what is actually the demonstrator doing?
Transferring the standard solution into the volumetric flask.
Measuring the distilled water using the volumetric flask.
Titrating the acid with the base.
Preparing the standard solution in the volumetric flask.
