Neck masses are common in adults, but the underlying cause is not always easily identified. This guideline is an important instrument for the early diagnosis and treatment of potentially malignant growths, especially with the rise of HPV-related head and neck cancer.
It is easily produced by igniting a mixture of zinc and sulfur. Since zinc sulfide is insoluble in water, it can also be produced in a precipitation reaction. Solutions containing Zn 2+ salts readily form a precipitate ZnS in the presence of sulfide ions (e.g., from H 2 S). Zn 2+ + S 2â â ZnS. This reaction is the basis of a gravimetric analysis for zinc.
Certain salts, such as the dichromates, borates, and silicates, act as inhibitors to the aqueous corrosion of zinc. 2 S) is also harmless because insoluble zinc sulfide (ZnS) is formed. On the other hand, SO 2 and chlorides have a corrosive action because water-soluble and hygroscopic salts are formed.