amit

dont rush on any thing i will be more than happy if some expert comment on above method(electrolysis). i dont think we can precipitate iron as such as after some time FeSO4 will be no more soluble. or crystallization may follow but ppt of iron i dont think so

its fine i m more than happy if that book is wrong. but only thing is as carbon is more electronegative then hydrogen hence i also believe that there must be some intersaction although of no significance. as wikipedia says it is in carbon also "especially " in CCl4 etc... it means there must be cases in hydrocarbon also like if i cool it to temp say of liquid He

try going on this link http://www.ncbi.nlm.nih.gov/pubmed/17705268 what i under stood is that it can happen. according to following article on wiki pedia http://en.wikipedia.org/wiki/Hydrogen_bond "Carbon can also participate in hydrogen bonding, especially when the carbon atom is bound to several electronegative atoms, as is the case in chloroform, CHCl3. The electronegative atom attracts the electron cloud from around the hydrogen nucleus and, by decentralizing the cloud, leaves the atom with a positive partial charge."

nope as i believe its in aquous medium

i think i got the answer guys. go to the following link http://books.google.co.in/books?id=LpJPWKT3PNcC&pg=PA342&lpg=PA342&dq=nickel+dmg+complex+and+water+of+hydration&source=web&ots=Drx3vBIkpK&sig=eHLrs7Uxsl3lPl7uXPiNvN7WfU8&hl=en&ei=LyCUSc2SDpKwkAWq-4CjCw&sa=X&oi=book_result&resnum=1&ct=result or book introduction to modern inorganic chemistry by mackay on page 343 this structure is given. now water removed is from the oxime. hence it wasn't mentioned in vogel etc as it is not co ordinated from solvent but its there in the oximehttp://books.google.co.in/books?id=LpJPWKT3PNcC&pg=PA342&lpg=PA342&dq=nickel+dmg+complex+and+water+of+hydration&source=web&ots=Drx3vBIkpK&sig=eHLrs7Uxsl3lPl7uXPiNvN7WfU8&hl=en&ei=LyCUSc2SDpKwkAWq-4CjCw&sa=X&oi=book_result&resnum=1&ct=result

i always wanted some exiting softwares for chemical use. why dont u all post links to some of the best softwares that can be used by students etc of various field in chemistry.

one can use simple centrifuge machines to seperate thiocyanide complex along with unsoluble impurities. now solid mass obtained can again be addded in appropriate solvent to remove unsoluble impurities. i dont know the cost related factors as i havent brought any chemicals till now . college lab does it for us. what about some electrochemical way to get iron or aluminium out. reduction potentials:- Fe2+ to Fe =-.044v Fe3+ to Fe =-.036v Al3+ to Al =-1.66 v hence take the solution containing both Al and Fe take Al electrode as anode Fe electrode as cathode and apply potential difference greater then 1.5 v. i think iron will seperate out by depositing on Fe electrode. though expert comments invited

i wont say h bonds don't exist in hydrocarbons as i read in a book that hydrogen bonding up to some extent is in every molecule but the bonding energy is so low at even very low tempretures can offset its effect

actually i also thougt the same but vogel practical manual doesn't mention it besides won't it bring error in gravimetric analysis if any compoun can exist in hydrated state as well as the other

why dont remove Fe by complexing with CNS etc and converting it to Fe2O3 later after seperation

hydrogen bonding in hydrocarbons is to such a least extent that it wont be wrong to say its not there. hence only due to london forces its viscous which in turn depends on size.

recently in gravimetric experiment i made nickel dmg complex which was red coloured. i left it in dessicator for week. i turned white(yellowish). while trying to wash the crucible(filter used in gravimetry) as soon as i poured water it turned red again. whats happening

ya . i believe its because that solution when left undisturbed attains meta stable state which is broken with any interruption. any wa i read in news paper that adding mentos in diet coke gives u a nice fountain. search youtube. reason listed eruption of co2 because of surface of mentos.(i doubt it though)

i may be wrong but cant we use some under graduate method of presipitating some derivative of benzeldihyde (like oximes or something) and convert it back to benzaldehyde. also as far removal of CN- is concerned what about complexing them with some other metals using phase transfer method. which distillation would be better steam or reduced pressure?

today while working in lab i got some strange results:- anions detected:- carbonate, bromide, phosphate cations:- arsenate (others have not been tested till now) i was going by vogel and passed H2S in acidified (with HNO3) soda extract of mixture given. arsenate was presipitated(deep yellow) and centrifugated. then ammonium molybadate was to be added in soda extract gained. first it was heated to remove H2S. as soon as molybedate was added instead of yellow (indication of phosphate) solution turned deep blue. what is now in the test tube?

despite test of sulphate one can also test for physical charachteristics like boiling point and melting point and viscocity. though temp measuring wont help that much as its melting and boiling points are little extreme

thanks a lot u guys. my problem is solved

how to make ph paper from common kitchen vegitables. actually i read some where that they can be made from onion peel. how that can be?

thanks for ur help ,epoxy glue is quiet easily available as instant fixers here.

actually acrylic resin is used in moulding the metallic samples (like soil containing heavy metals) in a form of a capsules like structure to put it in the machine

actually i didnt know where to put this question hence i decided to put it in field i m working in. what compound we can use instead of acrylic resin in scanning electron microscope?

why magnesium shows +2 state why dont it settle for +1. energy for +2 is 5 times higher

recently i saw a question why despite of high hydration energy LiF is not hydrated while LiX (X=Cl,Br,I) are?

i think its an derivative of esters with calcium at the place of carbon hence name in iupac should be calcium methanoate or calcium ethanoate (actuall i cant remember whether carbon of coo- group should also be counted or not). its more used name will be calcium acetate:eyebrow: