BORAX AND DIBORANE By - Tasneem Hussain
Borax (Na,B,O7.10H,O) White crystalline solid. Contains tetranuclear units [B4O,(OH)412 hence correct formula is Na2[B405(OH)41.8H20. Reacting component in glassy bead - B203 Preparation . From colemanite: 2P6011
Properties 1. Solution is basic in nature Na2B40, 7H2O -> 2NaOH 4H3BO 2. Action of heat 2 4 7 10H20 Anhydrous. 740 C Transparent bead Borax bead test - Borax on strong heating forms B203 which forms coloured glassy bead with coloured compounds of certain metals. Uses 1. Used in the manufacture of enamels, glazes,pyrex glass used on production of crystal glass and optical glasses, soap and drying oils.
2. Also used as cleansing and stiffening agent in laundry work and in candle industry. 3. Used for glazing paper,playing cards and as an antiseptic 4. Used in water softening. 5. Used as flux 6. Used for borax bead test. 7. Used in medicine.
Diborane - B2H6 . Preparation 1. 2NaBH +1BH2NaH2 2 6 21 6 Properties 1. B2H6 + 302--> B,03 + 3H20; c =-1976 kj/mol. 2. B2H6 + 6H20 ---> 2H3BO3 6H2
4. Reaction with ammonia 2NH3 + B2H [BH2(NH3)21+BH4 Borazine is known as inorganic benzene. known as inorganic naphthalene 5. B2Hs 2CO -> 2BH3.CO (Borine carbonyl) 6. Reaction with amine D26 2 16 Structure of diborane Four terminal of hydrogen atoms and the two boron atoms lie in one plane.
Uses of boranes 1. Used as a catalyst in polymerisation reactions. 2. Used as reducing agent in organic reactions. 3. Used for welding torches. 4. For preparation of high energy fuels and propellents. 5. Hydroboration is a useful method for preparing hydrocarbons,alcohols,ketones and acids.
Persuing MBBS from PCMS AND RC Bhopal Find Quiz based on previous years papers of NEET, AIIMS and AIPMT on my feed.