2. POTASSIUM BROMIDE Name: Yuki Ng Class: 3A Class Number: 30

3. CONTENT Basic Information (Name, Formula, Electron Diagram) Physical Properties Chemical Properties Others (Uses, Potential hazards, special characteristics) Reference

4. POTASSIUM BROMIDE Formula: KBr Electron Diagram: + - KBr

5. PHYSICAL PROPERTIES melting point: 734 °C (1007 K) boiling point: 1435 °C (1708 K) physical state at room temperature: solid colour: white solubility in water: 53.5 g/100 ml (0 °C) density: 2.75 g/cm 3 electrical conductivity: electrolyte  it conducts electricity  only in molten and aqueous states, but not solid

6. CHEMICAL PROPERTIES  laboratory preparation: A traditional method for the manufacture of KBr is the reaction of potassium carbonate with a bromide of iron, Fe 3 Br 8, made by treating scrap iron under water with excess Br 2 : 4 K 2 CO 3 + Fe 3 Br 8 → 8 KBr + Fe 3 O 4 + 4 CO 2  An reducing agent  Reactivity : 1) Is not in generally strong reactive. 2) Incompatible with oxidizing agents 3) Violent reactions occur with bromine trifluoride.

7. OTHERS Uses: 1) Veterinary -treat epilepsy( 癲癇 )in animals 2) Medical -sedative( 鎮靜劑 ) -an antiepileptic drug 3) For optical windows and prisms 4) photographic emulsion ( 感光乳劑 ) 5) lithography ( 平版印刷術 ) 6) water clarification Potential hazards: Oxides of the contained metal and halogen.

8. OTHERS Interesting or special characteristics 1) In a dilute aqueous solution, potassium bromide tastes sweet, at higher concentration it tastes bitter, and when most concentrated it tastes salty to humans. 2) In high concentration potassium bromide -May cause eye and skin irritation -Strongly irritates the gastric mucous membrane, leading to nausea and sometimes vomiting. 3) Potassium bromide should be given with food.

9. REFERENCE  Wikipedia  Answers.com (http://www.answers.com/topic/potassium-bromide)http://www.answers.com/topic/potassium-bromide  http://www.chemicalland21.com/industrialchem/inor ganic/POTASSIUM%20BROMIDE.htm http://www.chemicalland21.com/industrialchem/inor ganic/POTASSIUM%20BROMIDE.htm  Jt-baker (http://www.jtbaker.com/msds/englishhtml/p5587.htm)http://www.jtbaker.com/msds/englishhtml/p5587.htm  Optics Lands (http://www.sciner.com/Opticsland/KBr.htm)http://www.sciner.com/Opticsland/KBr.htm  http://www.marvistavet.com/html/potassium_bromid e.html http://www.marvistavet.com/html/potassium_bromid e.html  http://www.canine- seizures.freeservers.com/potassium_bromide.htm http://www.canine- seizures.freeservers.com/potassium_bromide.htm

10. THE END Thank you