Question
Learn more about Robbie's experiment.
"During an experiment, Robbie poured 100 milligrams (mg) of liquid solvent Y into a beaker and heated it to 75°C. Subsequently, 20 mg of solid solute X was crushed into 1-millimeter (mm) pieces and introduced into the beaker. The mixture was stirred for 1 minute and then left undisturbed for 10 minutes. It was observed that the final solution contained 20% of the solute in the form of an undissolved solid."
Which of the following modifications would have reduced the quantity of undissolved solid at the conclusion of Robbie's experiment?
(1 point)
Responses
Allowing the mixture to rest for 7 minutes rather than 10 minutes.
Allowing the mixture to rest for 7 minutes rather than 10 minutes.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Crushing the solute into particles of 2 mm instead of 1 mm.
Crushing the solute into particles of 2 mm instead of 1 mm.
Stirring the mixture for 3 minutes instead of 1 minute.
"During an experiment, Robbie poured 100 milligrams (mg) of liquid solvent Y into a beaker and heated it to 75°C. Subsequently, 20 mg of solid solute X was crushed into 1-millimeter (mm) pieces and introduced into the beaker. The mixture was stirred for 1 minute and then left undisturbed for 10 minutes. It was observed that the final solution contained 20% of the solute in the form of an undissolved solid."
Which of the following modifications would have reduced the quantity of undissolved solid at the conclusion of Robbie's experiment?
(1 point)
Responses
Allowing the mixture to rest for 7 minutes rather than 10 minutes.
Allowing the mixture to rest for 7 minutes rather than 10 minutes.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Crushing the solute into particles of 2 mm instead of 1 mm.
Crushing the solute into particles of 2 mm instead of 1 mm.
Stirring the mixture for 3 minutes instead of 1 minute.
Answers
GPT-4o mini
To reduce the quantity of undissolved solid at the conclusion of Robbie's experiment, the most effective modification would be:
**Stirring the mixture for 3 minutes instead of 1 minute.**
Stirring helps to promote the dissolution of the solute by increasing the interaction between the solute particles and the solvent. A longer stirring time allows more solute to come into contact with the solvent, potentially increasing the amount of solute that dissolves.
### Considerations for the Other Options:
1. **Allowing the mixture to rest for 7 minutes rather than 10 minutes:**
- Allowing less time for the solute to dissolve could potentially result in more undissolved solid rather than less.
2. **Increasing the temperature of the solvent to 50°C rather than 75°C:**
- Lowering the temperature typically decreases the solubility of solids in liquids. Therefore, this would likely increase the quantity of undissolved solid.
3. **Crushing the solute into particles of 2 mm instead of 1 mm:**
- Larger particles would dissolve more slowly, likely increasing the amount of undissolved solid.
In summary, extending the stirring time would likely enhance solubility and reduce the amount of undissolved solid in Robbie's experiment.
**Stirring the mixture for 3 minutes instead of 1 minute.**
Stirring helps to promote the dissolution of the solute by increasing the interaction between the solute particles and the solvent. A longer stirring time allows more solute to come into contact with the solvent, potentially increasing the amount of solute that dissolves.
### Considerations for the Other Options:
1. **Allowing the mixture to rest for 7 minutes rather than 10 minutes:**
- Allowing less time for the solute to dissolve could potentially result in more undissolved solid rather than less.
2. **Increasing the temperature of the solvent to 50°C rather than 75°C:**
- Lowering the temperature typically decreases the solubility of solids in liquids. Therefore, this would likely increase the quantity of undissolved solid.
3. **Crushing the solute into particles of 2 mm instead of 1 mm:**
- Larger particles would dissolve more slowly, likely increasing the amount of undissolved solid.
In summary, extending the stirring time would likely enhance solubility and reduce the amount of undissolved solid in Robbie's experiment.