[cyrosceals]

Hi everyone, I got a question for you guys (I dont really understand the question at all!):

A radioactive sample of Na₂S₂O₃ was prepared by boiling solid ³²S with Sodium sulphite Na₂ ³²S₂O₃. Adding HCl(aq) to this sample cause all ³⁵ S to precipitate as sulphur leaving a resultant solution that contains non-radioactive sulphite ions.

Which is the correct displayed formula of thiosulphate ion produced?

ANS:


Can anyone guide me through the thought process? I have 0 understanding of the question. Thanks.