in the test for halogens a student acidified his filtrate with dilute HNO3, shoo

Question

in the test for halogens a student acidified his filtrate with dilute HNO3, shook the tube well and found the solution to be acidic. he then added AgNO3 solution and obtained a black precipitate. write the formula of the formed black precipitate. what mistake did he do in the analysis for halogen in the test for halogens a student acidified his filtrate with dilute HNO3, shook the tube well and found the solution to be acidic. he then added AgNO3 solution and obtained a black precipitate. write the formula of the formed black precipitate. what mistake did he do in the analysis for halogen in the test for halogens a student acidified his filtrate with dilute HNO3, shook the tube well and found the solution to be acidic. he then added AgNO3 solution and obtained a black precipitate. write the formula of the formed black precipitate. what mistake did he do in the analysis for halogen

Explanation / Answer

the black precipitate is due to sulfide. the formula of black precipitate : Ag2S

the sudent should have removed before adding HNO3. the sulfide can be removed by boiling in the test tube . then the test tube is free from sulfide

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