Greetings,
I'll appreciate your answers.
Please list the solvents that can dissolve NiS.
Thanks.
Do you mean a cleaner for cleaning of nickel surfaces in the household (glossy nickel is dark because of NiS layer formation) or do you want to dissolve the mineral Millerite?
In the first case, a rag will suffice, moistened with ammonia water or diluted hydrogen peroxide or acetic acid, but in the second case you will need a strong mineral acid like H2SO4, HNO3 or HCl.
Please see the attached article which indicates that one type of NiS has benzene or toluene as possible solvents for it. I think that NiS is insoluble in water & the like but it is expected to be soluble in either non-polar solvents such as dodecane or slightly polar solvents such as chloroform.
https://www.degruyter.com/downloadpdf/j/msp.2015.33.issue-1/msp-2015-0017/msp-2015-0017.pdf
I do not expect NiS to be soluble in a highly polar solvent such as acetone.
I. It is possible to obtain a stable aq. colloidal suspension of NiS in alkaline aq. sol. of ammonium sulfide and ammonia, (NH4)2S + NH4OH. If required, the pH can be then decreased to some extent, by partial titration with HCl. The suspending solution may contain partially dissolved Ni(II), distributed among species such as Ni(OH)2, [Ni(NH3)6]2+, [NiCl4]2-, Ni(HS)2, Ni2+. This suspension oxidizes if exposed to air.
II. NiS can be readily reactively dissolved with hot conc. nitric acid or with aqua regia, what is accompanied by sulfur precipitation.
III. NiS slowly reactively dissolves in (cold) conc. HCl.
Is it possible to form stable NiS suspension in solution to be used as an ink?@nizar matar
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