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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Mr. Heisenberg on October 09, 2016, 02:33:25 PM

Title: ZnS
Post by: Mr. Heisenberg on October 09, 2016, 02:33:25 PM

I have buffer solution (HCOOH and for example HCOONa) and mix of cations (Zn2+, Fe2+, Al3+, Cr3+, Fe3+, Mn2+, Ni2+, Co2+). I add H2S or CH3CSNH2. Can I obtain selective sediment of ZnS? Zinc sulphide, nickel sulphide, cobalt sulphide have similar solubility. I think those sulphides can precipitate together.

Title: Re: ZnS
Post by: Borek on October 09, 2016, 06:53:44 PM

You will need pH of the buffer as a first step.

Title: Re: ZnS
Post by: AWK on October 10, 2016, 01:59:03 AM

Definitely, no.