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,BTEC Level 3 Applied Science Unit 2: Practical Scientific Procedures and Techniques
Learning Aim A: Undertake Titration and Colorimetry to Determine the Concentration of Solutions
2026/2027 Examination
Total Questions: 200
Instructions:
• Answer all questions.
• Select the single best answer.
• Each question has four answer choices: A, B, C, and D.
• Select only ONE answer for each question.
SECTION 1: Titration Fundamentals and Apparatus
Questions 1–25
Q1. Which piece of apparatus is specifically designed to deliver a variable, accurately measured
volume of liquid during a titration?
A. Volumetric pipette
B. Burette
C. Conical flask
D. Graduated cylinder
Correct Answer: B. Burette
Rationale: A burette is a graduated glass tube with a stopcock that allows the controlled,
variable delivery of titrant. A volumetric pipette delivers a single fixed volume, while a conical flask
and graduated cylinder are not designed for precise variable delivery during titration.
Q2. What is the primary purpose of a titration?
A. To determine the melting point of a solid
B. To determine the unknown concentration of a solution using a solution of known concentration
C. To separate mixtures based on boiling point differences
D. To measure the pH of a solution directly
Correct Answer: B. To determine the unknown concentration of a solution using a solution of
known concentration
Rationale: Titration is a volumetric analysis technique where a solution of known concentration
(titrant) reacts with a solution of unknown concentration (analyte) to determine the unknown
concentration. Melting point determination, distillation, and direct pH measurement are different
techniques.
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, Q3. A student rinses the burette with distilled water but does not rinse it with the titrant before
filling. What effect will this have on the calculated concentration of the analyte?
A. The calculated concentration will be too high
B. The calculated concentration will be too low
C. There will be no effect on the calculated concentration
D. The titration will not reach an endpoint
Correct Answer: A. The calculated concentration will be too high
Rationale: Residual distilled water in the burette dilutes the titrant, meaning a larger volume of
titrant must be delivered to reach the endpoint. Since the calculation assumes the titrant is at its
stated concentration, the larger volume leads to an overestimation of the analyte concentration.
Q4. Which of the following is the correct definition of the endpoint in a titration?
A. The point at which the reactants have completely reacted in stoichiometric proportions
B. The point at which the indicator changes color, signalling the completion of the reaction
C. The point at which the pH of the solution is exactly 7
D. The point at which the burette reading is exactly 25.00 cm³
Correct Answer: B. The point at which the indicator changes color, signalling the completion of
the reaction
Rationale: The endpoint is the observable change (usually a color change) that indicates the
reaction is complete. The equivalence point is the theoretical point where stoichiometric amounts
have reacted. They are ideally very close but are not the same concept.
Q5. Why is a conical flask preferred over a beaker for holding the analyte during a titration?
A. It has a larger capacity
B. Its tapered sides allow for easier swirling without splashing
C. It is made of stronger glass
D. It has volume graduations on the side
Correct Answer: B. Its tapered sides allow for easier swirling without splashing
Rationale: The conical shape reduces the risk of splashing when the flask is swirled to mix the
reactants. This is important for ensuring complete and accurate mixing without loss of solution.
Capacity and glass strength are not the primary reasons.
Q6. What is the purpose of adding a few drops of indicator to the analyte solution before
titration?
A. To increase the rate of reaction
B. To provide a visual signal when the endpoint is reached
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, C. To neutralize any impurities in the solution
D. To change the stoichiometry of the reaction
Correct Answer: B. To provide a visual signal when the endpoint is reached
Rationale: Indicators are weak acids or bases that change color at a specific pH range. They do
not affect the reaction stoichiometry or rate; they simply provide a visual indication that the reaction
is complete.
Q7. A 25.0 cm³ volumetric pipette is used to measure the analyte. Why is it important to ensure
the pipette is clean and rinsed with the analyte solution?
A. To prevent contamination that could alter the concentration of the analyte
B. To make the pipette easier to handle
C. To increase the volume delivered by the pipette
D. To change the color of the solution
Correct Answer: A. To prevent contamination that could alter the concentration of the analyte
Rationale: Any residual liquid in the pipette could dilute or contaminate the analyte, leading to
inaccurate results. Rinsing with the analyte solution ensures that only the intended solution is
delivered.
Q8. What is the reading on a burette if the meniscus is level with the 15.50 cm³ mark and the
initial reading was 2.40 cm³?
A. 13.10 cm³
B. 15.50 cm³
C. 17.90 cm³
D. 12.90 cm³
Correct Answer: A. 13.10 cm³
Rationale: The volume delivered is calculated by subtracting the initial reading from the final
reading: 15.50 − 2.40 = 13.10 cm³. This represents the actual volume of titrant used.
Q9. Which of the following best describes a primary standard?
A. A solution whose concentration is determined by titration against another solution
B. A highly pure, stable substance used to prepare a solution of accurately known concentration
C. A solution that changes color at the endpoint
D. Any solution with a concentration greater than 1 mol dm⁻³
Correct Answer: B. A highly pure, stable substance used to prepare a solution of accurately
known concentration
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,BTEC Level 3 Applied Science Unit 2: Practical Scientific Procedures and Techniques
Learning Aim A: Undertake Titration and Colorimetry to Determine the Concentration of Solutions
2026/2027 Examination
Total Questions: 200
Instructions:
• Answer all questions.
• Select the single best answer.
• Each question has four answer choices: A, B, C, and D.
• Select only ONE answer for each question.
SECTION 1: Titration Fundamentals and Apparatus
Questions 1–25
Q1. Which piece of apparatus is specifically designed to deliver a variable, accurately measured
volume of liquid during a titration?
A. Volumetric pipette
B. Burette
C. Conical flask
D. Graduated cylinder
Correct Answer: B. Burette
Rationale: A burette is a graduated glass tube with a stopcock that allows the controlled,
variable delivery of titrant. A volumetric pipette delivers a single fixed volume, while a conical flask
and graduated cylinder are not designed for precise variable delivery during titration.
Q2. What is the primary purpose of a titration?
A. To determine the melting point of a solid
B. To determine the unknown concentration of a solution using a solution of known concentration
C. To separate mixtures based on boiling point differences
D. To measure the pH of a solution directly
Correct Answer: B. To determine the unknown concentration of a solution using a solution of
known concentration
Rationale: Titration is a volumetric analysis technique where a solution of known concentration
(titrant) reacts with a solution of unknown concentration (analyte) to determine the unknown
concentration. Melting point determination, distillation, and direct pH measurement are different
techniques.
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, Q3. A student rinses the burette with distilled water but does not rinse it with the titrant before
filling. What effect will this have on the calculated concentration of the analyte?
A. The calculated concentration will be too high
B. The calculated concentration will be too low
C. There will be no effect on the calculated concentration
D. The titration will not reach an endpoint
Correct Answer: A. The calculated concentration will be too high
Rationale: Residual distilled water in the burette dilutes the titrant, meaning a larger volume of
titrant must be delivered to reach the endpoint. Since the calculation assumes the titrant is at its
stated concentration, the larger volume leads to an overestimation of the analyte concentration.
Q4. Which of the following is the correct definition of the endpoint in a titration?
A. The point at which the reactants have completely reacted in stoichiometric proportions
B. The point at which the indicator changes color, signalling the completion of the reaction
C. The point at which the pH of the solution is exactly 7
D. The point at which the burette reading is exactly 25.00 cm³
Correct Answer: B. The point at which the indicator changes color, signalling the completion of
the reaction
Rationale: The endpoint is the observable change (usually a color change) that indicates the
reaction is complete. The equivalence point is the theoretical point where stoichiometric amounts
have reacted. They are ideally very close but are not the same concept.
Q5. Why is a conical flask preferred over a beaker for holding the analyte during a titration?
A. It has a larger capacity
B. Its tapered sides allow for easier swirling without splashing
C. It is made of stronger glass
D. It has volume graduations on the side
Correct Answer: B. Its tapered sides allow for easier swirling without splashing
Rationale: The conical shape reduces the risk of splashing when the flask is swirled to mix the
reactants. This is important for ensuring complete and accurate mixing without loss of solution.
Capacity and glass strength are not the primary reasons.
Q6. What is the purpose of adding a few drops of indicator to the analyte solution before
titration?
A. To increase the rate of reaction
B. To provide a visual signal when the endpoint is reached
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, C. To neutralize any impurities in the solution
D. To change the stoichiometry of the reaction
Correct Answer: B. To provide a visual signal when the endpoint is reached
Rationale: Indicators are weak acids or bases that change color at a specific pH range. They do
not affect the reaction stoichiometry or rate; they simply provide a visual indication that the reaction
is complete.
Q7. A 25.0 cm³ volumetric pipette is used to measure the analyte. Why is it important to ensure
the pipette is clean and rinsed with the analyte solution?
A. To prevent contamination that could alter the concentration of the analyte
B. To make the pipette easier to handle
C. To increase the volume delivered by the pipette
D. To change the color of the solution
Correct Answer: A. To prevent contamination that could alter the concentration of the analyte
Rationale: Any residual liquid in the pipette could dilute or contaminate the analyte, leading to
inaccurate results. Rinsing with the analyte solution ensures that only the intended solution is
delivered.
Q8. What is the reading on a burette if the meniscus is level with the 15.50 cm³ mark and the
initial reading was 2.40 cm³?
A. 13.10 cm³
B. 15.50 cm³
C. 17.90 cm³
D. 12.90 cm³
Correct Answer: A. 13.10 cm³
Rationale: The volume delivered is calculated by subtracting the initial reading from the final
reading: 15.50 − 2.40 = 13.10 cm³. This represents the actual volume of titrant used.
Q9. Which of the following best describes a primary standard?
A. A solution whose concentration is determined by titration against another solution
B. A highly pure, stable substance used to prepare a solution of accurately known concentration
C. A solution that changes color at the endpoint
D. Any solution with a concentration greater than 1 mol dm⁻³
Correct Answer: B. A highly pure, stable substance used to prepare a solution of accurately
known concentration
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