9 Questions
What is the role of sodium carbonate in the extraction of caffeine?
React with tannin and gallic acid to form products soluble in dichloromethane
What is the purpose of anhydrous sodium sulfate in the extraction process?
Remove water from the organic layer
What is sublimation as described in the text?
Transition of a solid into a gas without passing through the liquid stage
Which type of impurity makes substances suitable for purification by sublimation?
Non-volatile impurities
At what temperature does benzoic acid change from a solid to a liquid?
$122C$
What distinguishes pure substances from impure substances in terms of melting points?
Impure substances melt over a wide range of temperatures
Why is benzoic acid commonly used as a food preservative?
Due to its antifungal properties
What distinguishes substances suitable for sublimation purification?
Non-volatile impurities or lower vapor pressure than pure compounds
Which process involves the conversion of a solid directly into a gas?
Sublimation
Explore the processes of qualitative and quantitative analysis in chemical analysis. Learn about the techniques used to determine the chemical composition of a sample, identify the presence or absence of specific elements, and quantify sample elements. Methods covered include distillation, extraction, precipitation, chromatography, and spectroscopy.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
