sodium metabisulphite or sodium metabisulphate

[moh_omari2]

hello experts ( hope my english is ok ,,sorry if u finde some mistake )

can any one answer me this
is it sodium metabisulphite or sodium metabisulphate

in wikipedia the speleng is like this ..sodium metabisulfite Na2S2O5

whice one is correct

when u watch some videos u finde a big difrent in the spelling ,like sulphate or sulphite .
one letter in chimistry changed every thing

pleas any one can name the good speling and what smb to use

 

[shmandi]

It depends what you are looking for.
For percipitating gold from solution sodium metabisulfite (Na2S2O5) is used.

 

[bswartzwelder]

Use the search function on the forum. This has been asked and answered many, many times.