* ammonium sulphide: (NH4)2S ammonium sulphite: (NH4)2SO3
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Ammonium sulfide is a compound with the formula (NH4)2S, formed from ammonia and hydrogen sulfide, and is used in various applications such as in analytical chemistry and as a reducing agent. On the other hand, sulfite refers to the sulfite ion, SO3^2-, or compounds containing this ion, and is commonly used as a food preservative. Sulfite can also be involved in various chemical reactions as a reducing or oxidizing agent.
The reaction between dilute nitric acid and sodium sulfide will produce hydrogen sulfide gas, sodium nitrate, and water. The balanced chemical equation for this reaction is 2HNO3 + Na2S → 2NaNO3 + H2S.
A sufide is an anion form of the element sulfur. It can form compounds if it combines with other elements. Sulfide on it's own is not a compound, you need a prefix to that like Hydrogen Sulphide. Do not get this mixed up with a sulfate; you can get copper sulphate but not copper sulfide.
Anions have names that end in -ide. Anions are negatively charged ions that are created when atoms gain electrons during chemical reactions. Examples include chloride (Cl−), fluoride (F−), and sulfide (S2−).
A Sulfide ion has a full complement of 8 valence electrons. Sulfur is element 16. It has 6 valence electrons in its outer energy level, however, sufide is S2- so it has gained 2 electrons to fill its outer energy level.