purchase of chemicals :-1 sulphuric acid ar assay 96-98 2 hydrochloric acid ar colourss assay 35-38 3 sodium hydroxide pellets 4 benzene ar 5 petroleum ether or petroleum benzene ar boiling point 40-60c 6 liq. ammonia solution 25 ar 7 glycerol anhydrous ar 8 iso butanol ar 9 fehling a solution 10 fehling b solution 11 xylene ar 12 paraffin liquid light 13 silica gel self indicating coarse blue 14 toluene ar 15 magnesium salt of edta ar.