Qualitative analysis. Chemical reactions for identification of some cations and anions with biological importance. Concernments.
Introduces qualitative analysis and its four test types: preliminary, dry, wet and confirmatory. Gives identification reactions for sodium, potassium, calcium, magnesium and iron cations, and for chloride, sulfate and phosphate anions, with precipitate or colour observations. Closes with the biological role of electrolytes and a short section on concrements such as kidney stones and gallstones and their main components.
Topic 18 of 47 in the MU Pleven syllabus for Chemistry (Medicine, Year 1). The free AceMed note covers it in 7 sections, about 142 words (1 min of reading), with 13 flashcards.
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Qualitative analysis. Chemical reactions for identification of some cations and anions with biological importance. Concernments.
DEFINITION
CLASSIFICATION
IDENTIFICATION OF IMPORTANT CATIONS (WITH REACTIONS)
IDENTIFICATION OF IMPORTANT ANIONS
BIOLOGICAL IMPORTANCE
CONCREMENTS
DEFINITION
Qualitative analysis is the branch of analytical chemistry concerned with the identification of chemical constituents presents in a sample without determining their quantity.
CLASSIFICATION
1. Preliminary tests
2. Dry tests
3. Wet tests
4. Confirmatory tests
IDENTIFICATION OF IMPORTANT CATIONS (WITH REACTIONS)
Sodium (Na⁺):
Flame test → Golden yellow flame
Potassium (K⁺):
Flame test → Violet flame (seen through cobalt glass)
Calcium (Ca²⁺):
Ca²⁺ + C2O4²⁻ → CaC2O4 ↓ (white precipitate)
Magnesium (Mg²⁺):
Mg²⁺ + 2OH⁻ → Mg(OH)2 ↓ (white)
Iron (Fe³⁺):
Fe³⁺ + SCN⁻ → Blood‑red complex
IDENTIFICATION OF IMPORTANT ANIONS
Chloride (Cl⁻):
Cl⁻ + AgNO3 → AgCl ↓ (white ppt)
Sulfate (SO4²⁻):
SO4²⁻ + BaCl2 → BaSO4 ↓ (white ppt)
Phosphate (PO4³⁻):
Yellow precipitate with ammonium molybdate
BIOLOGICAL IMPORTANCE
Electrolytes are essential for nerve conduction, muscle contraction, acid‑base balance, and enzyme activity.
CONCREMENTS
Concernments are abnormal solid deposits formed in the body.
Examples: Kidney stones, gallstones.
Major components: Calcium oxalate, calcium phosphate, uric acid.
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