procurement of analytical reagents , ar / gr / equivalent grade-1 acetone gr / emparta / excelar 2 alkali blue 6b indicator 3 ammonia buffer solution, gr 4 liquor ammonia excelar. 5 ammonium acetate gr 6 ammonium chloride 7 ammonium heptamolybdate, gr / emparta / excelar 8 buffer solution, ph-4.0 9 buffer solution, ph-7.0 10 buffer solution, ph-9.0 11 buffer capsule ph 4.0 + / - 0.05 12 buffer capsule ph 7.0 + / - 0.05 13 buffer capsule ph 9.2.0 + / - 0.05 14 edta ( solution 0.02 n ) 15 ethyl alcohol 16 glycerol , gr 17 hydrochloric acid min, 35% gr 18 methyl alcohol. 19 mercuric thiocynate 20 nessler reaagent ( for ammonium ) 100ml 21 nitric acid 22 ortho tolidine lr 23 petroleum spirit ( petroleum ether ) , m.p 40-60 deg c 24 ph indicator paper, ph-1-14, with colour scale, makemerck 25 potassium hydroxide pellets, gr 26 pyrogallol 27 potassium iodide 28 potassium iodate, gr phenolphthalein ( 1% ) solution, gr 29 30 isopropyle alcohal 31 sulphuric acid ar 32 sodium hydroxide pellets, gr 33 sodium propionate ri 34 toluene, gr 35 universal indicator 36 whatman filter paper no 1 ( 125mm dia ) 37 whatman filter paper no 42 ( 125mm dia )