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Questions and Answers
During the titration of 50 mL of 0.1 M sodium hydroxide with 25 mL of acetic acid, which indicator from the table is most appropriate to use?
During the titration of 50 mL of 0.1 M sodium hydroxide with 25 mL of acetic acid, which indicator from the table is most appropriate to use?
- Methyl orange, because the pH at equivalence point is equal to 7
- Methyl orange, because the pH at equivalence point is less than 7
- Phenolphthalein, because the pH at equivalence point is equal to 7
- Phenolphthalein, because the pH at equivalence point is greater than 7 (correct)
Why is it important to select an appropriate indicator for acid-base titrations?
Why is it important to select an appropriate indicator for acid-base titrations?
- To ensure the reaction proceeds at a measurable rate.
- To prevent the formation of unwanted byproducts.
- To catalyze the neutralization reaction.
- To ensure a sharp color change occurs near the equivalence point. (correct)
What is the key factor to consider when choosing an indicator for a titration?
What is the key factor to consider when choosing an indicator for a titration?
- The pH range where the indicator changes color. (correct)
- The speed at which the indicator changes color.
- The molar mass of the indicator.
- The color of the indicator in its acidic form.
What would be the impact of using an indicator with a color change range that does NOT include the equivalence point pH in a titration?
What would be the impact of using an indicator with a color change range that does NOT include the equivalence point pH in a titration?
In a titration of a strong acid with a strong base, which of the following indicators would be most suitable?
In a titration of a strong acid with a strong base, which of the following indicators would be most suitable?
Calculate the number of moles of sodium hydroxide used in the titration described in the image.
Calculate the number of moles of sodium hydroxide used in the titration described in the image.
50 mL of 0.1 M sodium hydroxide is used to titrate 25 mL of acetic acid. What can you infer about the concentration of the acetic acid?
50 mL of 0.1 M sodium hydroxide is used to titrate 25 mL of acetic acid. What can you infer about the concentration of the acetic acid?
During a titration, a student observes that the indicator changes color before the expected equivalence point. What is the most likely cause of this error?
During a titration, a student observes that the indicator changes color before the expected equivalence point. What is the most likely cause of this error?
What type of reaction takes place during an acid-base titration?
What type of reaction takes place during an acid-base titration?
Which of the following best describes the equivalence point in an acid-base titration?
Which of the following best describes the equivalence point in an acid-base titration?
Consider a weak acid being titrated with a strong base. At what point in the titration is the concentration of the weak acid equal to the concentration of its conjugate base?
Consider a weak acid being titrated with a strong base. At what point in the titration is the concentration of the weak acid equal to the concentration of its conjugate base?
What is the purpose of standardizing a titrant?
What is the purpose of standardizing a titrant?
If the concentration of the NaOH titrant is not accurately known, how will this affect the titration results?
If the concentration of the NaOH titrant is not accurately known, how will this affect the titration results?
What type of error is introduced if the tip of the burette is not completely filled before starting a titration?
What type of error is introduced if the tip of the burette is not completely filled before starting a titration?
During a titration, a student overshoots the endpoint, adding too much titrant. What is the best course of action?
During a titration, a student overshoots the endpoint, adding too much titrant. What is the best course of action?
In the titration described, what piece of lab equipment is crucial for the accurate delivery of the titrant?
In the titration described, what piece of lab equipment is crucial for the accurate delivery of the titrant?
Why is it important to gently swirl or stir the solution in the flask during a titration?
Why is it important to gently swirl or stir the solution in the flask during a titration?
What does a titration curve typically show?
What does a titration curve typically show?
Which of the following is a primary standard suitable for standardizing a sodium hydroxide solution?
Which of the following is a primary standard suitable for standardizing a sodium hydroxide solution?
During a titration experiment, distilled water is used to rinse the walls of the Erlenmeyer flask. What effect does this have on the titration?
During a titration experiment, distilled water is used to rinse the walls of the Erlenmeyer flask. What effect does this have on the titration?
Flashcards
What is an indicator?
What is an indicator?
A chemical substance that indicates the acidity or alkalinity of a solution through color change.
Which indicator is suitable for the titration of sodium hydroxide with acetic acid?
Which indicator is suitable for the titration of sodium hydroxide with acetic acid?
Phenolphthalein is suitable, because the pH value will be greater than 7 for the neutral solution.
What is Indicator range?
What is Indicator range?
The pH range over which the indicator changes color.
Study Notes
- 50 ml of sodium hydroxide with a concentration of 0.1 M was titrated with 25 ml of acetic acid
- The question is: Using the following table, what is the appropriate indicator for the titration?
Indicators
- Phenolphthalein indicator range: 8.3-10
- Methyl orange indicator range: 3.1-4.4
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