Zinc sulfide reaction with hydrochloric acid

Write the molecular equation and the net ionic equation for the reaction of zinc sulfide with hydrochloric acid. 

The parent hexathiaadamantane (185) is obtained preparatively when a solution of formic acid and hydrochloric acid in nitrobenzene is allowed to stand for several weeks in a hydrogen sulfide atmosphere the product which separated is almost insoluble in all common solvents and purification presents a problem. Only large volumes of dimethyl sulfoxide at reflux serve for recrystallization.224 The reaction of thioacetic acid with formic acid in the presence of zinc chloride gives tetramethyl-(186), monomethyl-, dimethyl-and trimethylhexathiaadamantane derivatives (187).225 Other variations include the reaction of thioacetic acid with a /i-diketone,226 and the use of boron trifluoride227 or aluminum chloride as a catalyst.228... 

Hydrogen sulfide may be prepared conveniently in the laboratory in a Kipp apparatus by the reaction of iron(II) sulfide or zinc sulfide with dilute hydrochloric or sulfuric acid ... 

Manufacture of many important amino intermediates used for dyes and other purposes is usually by conversion or replacement of a substituent. For example, as already mentioned, in substituted nitro compounds, the nitro groups may be reduced with iron/hydrochloric acid, hydrogen and catalyst, or zinc in aqueous alkali. Partial reductions can be brought about with sodium sulfide. Amino groups may be introduced by replacing halogens in the aromatic ring. Another approach to amination is by attack on a substituted aromatic compound with ammonia or amines. Thus, for example, direct amination of p-chloronitrobenzene (15a) in the presence of a copper catalyst affords p-nitroaniline (15b) in almost quantitative yield l,4-dichloro-2-nitrobenzene (16) is converted in a similar way to 4-chloro-2-nitroaniline (17). Reactions of ammonia with carboxylic acids or anhydrides are carried out on an industrial scale. 

Testing for Completion. Reduction will not take place in the absence of ferrous iofis, which can be demonstrated by the lack of a black precipitate on spot testing with sodium sulfide solution. The reaction is considered complete when an aliquot no longer increases its take-up of sodium nitrite on further reduction with a stronger reducing agent, such as zinc and hydrochloric acid. 

Write a balanced equation for each of the following reactions (a) Sulfur dioxide reacts with water, (b) Solid zinc sulfide reacts with hydrochloric add. (c) Elemental sulfur reacts with sulfite ion to form thiosulfate, (d) Sulfur trioxide is dissolved in sulfuric acid. 

A mixture contained zinc sulfide, ZnS, and lead sulfide, PbS. A sample of the mixture weighing 6.12 g was reacted with an excess of hydrochloric acid. The reactions are... 

---