5 Questions
What is the significance of a smaller value of Ksp for a salt?
Lower solubility
Which silver salt begins to precipitate first in the given sequence?
AgI
What is used as an indicator in the precipitation titration for Cl- and Br- ions?
K2CrO4
At what pH level does Mohr's method of precipitation titration need to be done?
pH = 6.5 - 9
What happens when the pH is greater than 9 in precipitation titration using AgNO3?
Masking of the end point color
Study Notes
Solubility and Precipitation
- A smaller value of Ksp for a salt indicates that the salt is less soluble, meaning it is more likely to precipitate out of a solution.
- In a sequence of silver salts, the salt with the smallest Ksp value will begin to precipitate first.
Precipitation Titration
- Chrome Azurol S (CAS) is used as an indicator in the precipitation titration for Cl- and Br- ions.
- Mohr's method of precipitation titration requires a pH level of around 7.
Effects of pH on Precipitation Titration
- If the pH is greater than 9 in precipitation titration using AgNO3, the silver ions will react with hydroxide ions to form a silver oxide precipitate, interfering with the titration results.
Test your knowledge of solubility product constants with this quiz. Explore the precipitation titrations and learn about the detection of endpoints.
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