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Questions and Answers
What is the underlying principle upon which conductometric titration is based?
What is the underlying principle upon which conductometric titration is based?
- The fact that ions are replaced by others during the titration, leading to a change in conductivity. (correct)
- The change in temperature during the filtration process.
- The solution remains the same during the titration.
- The constant conductivity of ions throughout the titration.
During conductometric titration, the equivalence point can only be determined through chemical indicators, not graphically.
During conductometric titration, the equivalence point can only be determined through chemical indicators, not graphically.
False (B)
During the titration of a strong acid with a strong base, there is a decrease in ______ as highly mobile hydrogen ions (H+) are replaced by sodium ions (Na+).
During the titration of a strong acid with a strong base, there is a decrease in ______ as highly mobile hydrogen ions (H+) are replaced by sodium ions (Na+).
conductivity
What two processes are being followed when a mixture of a strong acid (like HCl) and a weak acid (like CH3COOH) is titrated against a strong base?
What two processes are being followed when a mixture of a strong acid (like HCl) and a weak acid (like CH3COOH) is titrated against a strong base?
Match the changes in conductivity with the stages of titrating a mixture of strong and weak acids with a strong base:
Match the changes in conductivity with the stages of titrating a mixture of strong and weak acids with a strong base:
What type of solution is prepared to standardize it using a primary standard like oxalic acid?
What type of solution is prepared to standardize it using a primary standard like oxalic acid?
When preparing solutions of acetic acid and hydrochloric acid for conductometric titration, the mass of components is not important as long as the volume is maintained.
When preparing solutions of acetic acid and hydrochloric acid for conductometric titration, the mass of components is not important as long as the volume is maintained.
What piece of equipment needs to be washed with distilled water and immersed in the solution when setting up the conductivity meter?
What piece of equipment needs to be washed with distilled water and immersed in the solution when setting up the conductivity meter?
During the standardization of NaOH using oxalic acid, concordant readings are essential for calculating the ______ of the NaOH solution.
During the standardization of NaOH using oxalic acid, concordant readings are essential for calculating the ______ of the NaOH solution.
Match the formula with the appropriate definitions:
Match the formula with the appropriate definitions:
In the standardization of acetic acid using NaOH, what does 'IBR' stand for when recording data?
In the standardization of acetic acid using NaOH, what does 'IBR' stand for when recording data?
The calculated strength of acetic acid ($N_1$) is directly proportional to the volume of acetic acid ($V_1$). That is, as $V_1$ increases, $N_1$ also increases.
The calculated strength of acetic acid ($N_1$) is directly proportional to the volume of acetic acid ($V_1$). That is, as $V_1$ increases, $N_1$ also increases.
In the context of standardizing HCl using NaOH, what is being determined when this titration is performed?
In the context of standardizing HCl using NaOH, what is being determined when this titration is performed?
In calculations for the standardization of a reagent, concordant readings from multiple titrations increase the ______ of the results.
In calculations for the standardization of a reagent, concordant readings from multiple titrations increase the ______ of the results.
For the titration of a mixture of acids, associate each point on the conductometric titration curve with the corresponding chemical process:
For the titration of a mixture of acids, associate each point on the conductometric titration curve with the corresponding chemical process:
What is the significance of the point where the curve changes direction on a conductometric titration graph?
What is the significance of the point where the curve changes direction on a conductometric titration graph?
The volume of NaOH required for the neutralization of acetic acid is greater than the volume of NaOH required for the neutralization of HCl in the experiment.
The volume of NaOH required for the neutralization of acetic acid is greater than the volume of NaOH required for the neutralization of HCl in the experiment.
Which point on the titration curve represents the neutralization point of hydrochloric acid?
Which point on the titration curve represents the neutralization point of hydrochloric acid?
According to the graph provided, the curve after point C is due to the presence of excess ______.
According to the graph provided, the curve after point C is due to the presence of excess ______.
Match the process occurring during conductometric titration with the corresponding effect on conductivity of the solution:
Match the process occurring during conductometric titration with the corresponding effect on conductivity of the solution:
Why is distilled water preferable to tap water for preparing solutions in conductometric titrations?
Why is distilled water preferable to tap water for preparing solutions in conductometric titrations?
Since the experiment involves acids and bases, it is acceptable to dispose of waste solutions directly into a regular drain without neutralization or special treatment.
Since the experiment involves acids and bases, it is acceptable to dispose of waste solutions directly into a regular drain without neutralization or special treatment.
What is the main reason for using a burette in conductometric titration rather than simply adding the titrant from a beaker?
What is the main reason for using a burette in conductometric titration rather than simply adding the titrant from a beaker?
In the conductometric titration experiment involving both strong and weak acid, the ______ of the weak acid starts only after the point where all of the strong acid is consumed.
In the conductometric titration experiment involving both strong and weak acid, the ______ of the weak acid starts only after the point where all of the strong acid is consumed.
Match the experimental step with its primary purpose:
Match the experimental step with its primary purpose:
Which of the following describes the consequence to the results if the concentration of the NaOH titrant has changed during the experiment?
Which of the following describes the consequence to the results if the concentration of the NaOH titrant has changed during the experiment?
A rough initial titration is unnecessary because accurate readings ensure the integrity of the data, making any preliminary approximation redundant.
A rough initial titration is unnecessary because accurate readings ensure the integrity of the data, making any preliminary approximation redundant.
If air bubbles are present in the burette tip during a conductometric titration, how will this affect the accuracy of the experiment?
If air bubbles are present in the burette tip during a conductometric titration, how will this affect the accuracy of the experiment?
When performing conductometric titrations, always record readings after ______ have been added to ensure reliable data.
When performing conductometric titrations, always record readings after ______ have been added to ensure reliable data.
Associate each item of laboratory apparatus used with its specific role in performing conductometric titrations:
Associate each item of laboratory apparatus used with its specific role in performing conductometric titrations:
Flashcards
Conductometric Titration
Conductometric Titration
Titration based on measuring changes in electrical conductivity.
Acid Mixture
Acid Mixture
A mixture containing both a strong acid and a weak acid.
Conductometer
Conductometer
Instrument used to measure a solution's electrical conductivity.
Ion Replacement
Ion Replacement
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Equivalence Point
Equivalence Point
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H+ to Na+ Replacement
H+ to Na+ Replacement
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Weak Acid Ionization
Weak Acid Ionization
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Step Increase
Step Increase
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Hydroxide Ions
Hydroxide Ions
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Standardization
Standardization
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Primary Standard
Primary Standard
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Study Notes
- In conductometric titration, the aim is to titrate a mixture of a strong and weak acid.
Apparatus Required
- Conductometer
- Conductance Cell
- Burette
- Pipette
- Beaker
- Standard flask
- Glass rod
- Burette Stand
Chemicals Required
- Distilled Water
- Hydrochloric acid
- Sodium hydroxide
- Oxalic acid
Theory of Conductometry
- Conductometry titration is based on the principle that, during titration, one ion is replaced by another.
- The two ions differ in ionic conductivity, resulting in a conductivity change in the solution during titration.
- The equivalence point can be located graphically by plotting the change in conductance as a function of the volume of titrant added.
- A mixture of a strong acid (HCl) and a weak acid (CH3COOH) is titrated against a strong base (NaOH).
- HCl reacts first, followed by CH3COOH.
- As a strong base is added, the highly mobile hydrogen ions (H+) are replaced by sodium ions (Na+), decreasing conductivity.
- The reaction is: NaOH + HCl → NaCl + H2O
- Once all the strong acid is consumed, the base reacts with the weak acid, increasing conductivity as unionized weak acid becomes ionized salt.
- The reaction is: CH3COOH + Na+ + OH- → CH3COO- + H+ + Na+ + OH-
- After both acids are consumed, there is a step increase in conductivity, indicating the endpoint.
- The increase in conductivity is due to the fast-moving hydroxide ions from the burette solution.
- From this, the amount of base consumed in the neutralization of HCl and CH3COOH is calculated.
Procedure
- Preparation of Solution
- Prepare 100ml of 0.1N NaOH solution and standardize it using a primary standard like oxalic acid.
- Prepare 100ml of 0.1N acetic acid and 0.01N oxalic acid solution and 0.1N HCl solution by dissolving a known weight in distilled water.
- Setting up the Conductivity meter
- Wash the conductivity cell with distilled water and immerse it in the solution.
- Connect the conductivity meter and calibrate it.
Standardization of NaOH Using Oxalic Acid
- N1 (Strength of oxalic acid) ≈ 0.01N
- V1 (Volume of oxalic acid) = 10ml
- N2 (Strength of NaOH) = ?
- V2 (Volume of NaOH consumed)
- N1V1 = N2V2
- N2 = (N1V1) / V2
- N2 = (0.01 * 10) / 1.1 = 0.09N
Standardization of Acetic Acid Using NaOH
- N1 (Strength of acetic acid) = ?
- V1 (Volume of acetic acid) = 10 ml
- N2 (Strength of NaOH) = 0.09N
- V2 (Volume of NaOH consumed)
- N1V1 = N2V2
- N1 = (N2V2) / V1 = (0.09 * 11) / 10 = 0.099N
Standardization of HCl Using NaOH
- N1 (Strength of HCl) = ?
- V1 (Volume of HCl) = 10ml
- N2 (Strength of NaOH) = 0.09N
- V2 (Volume of NaOH consumed)
Conductometry Titration Data
- Graphs show conductance (ms) vs Volume of NaOH (ml) during titration.
- 3.5 ml volume of NaOH is needed for the neutralization of HCl.
- 2.5 ml volume of NaOH is needed for the neutralization of acetic acid.
- Point B represents the neutralization point of HCl.
- Point C represents the neutralization point of acetic acid.
- The curve after point C is due to NaOH.
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