Kjeldahl Method and Nitrogen Determination Quiz
Test your knowledge of the Kjeldahl method, a chemical analysis technique used to quantitatively determine nitrogen in organic substances and inorganic compounds like ammonia and ammonium. Learn about its significance in measuring protein content and its limitations in detecting other forms of inorganic nitrogen.
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Kjeldahl Method and Nitrogen Determination Quiz
Quiz • 5 Questions
Kjeldahl Method and Nitrogen Determination Quiz - Flashcards
Flashcards • 5 Cards
Study Notes
1 min • Summary
Kjeldahl Method and Nitrogen Determination Quiz - Podcast
Podcast
Materials
List of Questions5 questions
- Question 1
- Ammonia
- Protein
- Organic substances
- Nitrate
- Question 2
- Water
- Catalysts like selenium, Hg2SO4 or CuSO4
- Extra sulfuric acid
- Additional organic substances
- Question 3
- Quantitative determination of all forms of nitrogen in a sample
- Qualitative determination of protein content
- Qualitative determination of nitrogen in inorganic compounds
- Quantitative determination of nitrogen in organic substances and ammonia/ammonium
- Question 4
- When the liquor clarifies with the release of fumes
- When the sample turns black
- After 10 minutes of heating
- When a visible residue is formed
- Question 5
- Nitric acid (HNO3)
- Sulfuric acid (H2SO4)
- Hydrochloric acid (HCl)
- Boric acid (H3BO3)
List of Flashcards5 flashcards
- Card 1HintThink about the method's main application.Memory TipKjeldahl: Know nitrogen, it's how to measure!
- Card 2HintRequires modification to measure *this* nitrogen compound.Memory TipKjeldahl misses nitrates without a special trick.
- Card 3HintSpeeds up the initial breakdown of the sample.Memory TipCatalysts help Kjeldahl digestion go faster.
- Card 4HintVisual cue indicating complete breakdown of the sample.Memory TipClear liquor signals Kjeldahl digestion is done.
- Card 5HintUsed to trap ammonia in the distillation process.Memory TipSulfuric acid is the key to Kjeldahl's measurement.