Write the chemical reaction equation for the formation of the white ppt that con
ID: 982645 • Letter: W
Question
Write the chemical reaction equation for the formation of the white ppt that conforms the presence of chloride ions, being sure to include charges and states of mater Carefully following the instruction! on the halogen test k very important to that the revolts are accurate Using the equation shown in the experiment, answer the following questions: What would be observed and concluded if sulfur Is present in the sample, and the acidified filtrate is NOT boiled long enough to except H_2S? What would be observed and concluded it nitrogen is present in the sample, and the acidified were not boiled long enough to expel HCN? What would be observed and concluded N the nitrate was mistakenly acidified with H_2SO_4 instead of with HNO_3? What would be observed and concluded if the filtrate was mistakenly acidified with HCL instead of with HNO_3?Explanation / Answer
1) Silver chloride is easily synthesized by combining aqueous solutions of silver nitrate and sodium chloride.
AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq) AgCl= white ppt
2) (b) Sulfur: To another portion of the filtrate add a few drops of a freshly prepared dilute solution of sodium nitroprusside (Na2[Fe(CN)5NO]). An intense pink coloration indicates the presence of sulfur. (i) Sulfur, Nitrogen present: When both these elements are present, fusion results in the formation of sodium sulfocyanide (Na+ CNS - ). The sodium carbonate extract may not respond to the Prussian blue test. In such case proceed as follows. Acidify 1 cc of sodium fusion extract with dil. HCl and add 1-2 drops of FeCl3 solution, a blood red coloration will indicate the presence of sulfur and nitrogen. (c) Halogens: Nitrogen and sulfur may interfere with the test for halogen. Thus, two different procedures are there for testing the presence of halogens. (i) Nitrogen and sulfur absent: A portion of the filtrate is acidified with dil. HNO3 an aqueous AgNO3 solution is added. A precipitate of silver halide (curdy white for Cl, pale yellow for Br and yellow for I) indicates the presence of chlorine, bromine and iodine in the O. S. If only one halogen is present, it may be identified by decanting the mother liquor, washing the precipitate with distilled water and treating the precipitate with dilute. aqueous ammonia.
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