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AN INTRODUCTION TO GROUP VII
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GROUP VII CONTENTS Testing for halides – AgNO3
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TESTING FOR HALIDES – AgNO3
• make a solution of the halide • acidify with dilute nitric acid - prevents the precipitation of other salts • add a few drops of silver nitrate solution • treat any precipitate with dilute ammonia solution • if a precipitate still exists, add concentrated ammonia solution
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TESTING FOR HALIDES – AgNO3
CHLORIDE white ppt of AgCl soluble in dilute ammonia BROMIDE cream ppt of AgBr insoluble in dilute ammonia but soluble in conc. IODIDE yellow ppt of AgI insoluble in dilute and conc. ammonia solution
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TESTING FOR HALIDES – AgNO3
CHLORIDE white ppt of AgCl soluble in dilute ammonia BROMIDE cream ppt of AgBr insoluble in dilute ammonia but soluble in conc. IODIDE yellow ppt of AgI insoluble in dilute and conc. ammonia solution halides precipitate as follows Ag+(aq) + X¯(aq) ——> Ag+X¯(s)
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TESTING FOR HALIDES – AgNO3
CHLORIDE BROMIDE IODIDE PLACE A SOLUTION OF THE HALIDE IN A TEST TUBE
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TESTING FOR HALIDES – AgNO3
CHLORIDE BROMIDE IODIDE ADD SOME DILUTE NITRIC ACID- this will stop the formation of other insoluble silver compounds eg silver hydroxide.
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TESTING FOR HALIDES – AgNO3 ADD SILVER NITRATE SOLUTION
CHLORIDE BROMIDE IODIDE ADD SILVER NITRATE SOLUTION WHITE PRECIPITATE OF SILVER CHLORIDE AgCl CREAM PRECIPITATE OF SILVER BROMIDE AgBr YELLOW PRECIPITATE OF SILVER IODIDE AgI
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TESTING FOR HALIDES – AgNO3 ADD DILUTE AMMONIA SOLUTION
CHLORIDE BROMIDE IODIDE ADD DILUTE AMMONIA SOLUTION WHITE PRECIPITATE OF SILVER CHLORIDE - SOLUBLE CREAM PRECIPITATE OF SILVER BROMIDE - INSOLUBLE YELLOW PRECIPITATE OF SILVER IODIDE - INSOLUBLE
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TESTING FOR HALIDES – AgNO3 ADD CONCENTRATED AMMONIA SOLUTION
CHLORIDE BROMIDE IODIDE ADD CONCENTRATED AMMONIA SOLUTION WHITE PRECIPITATE OF SILVER CHLORIDE - SOLUBLE CREAM PRECIPITATE OF SILVER BROMIDE - SOLUBLE YELLOW PRECIPITATE OF SILVER IODIDE - INSOLUBLE
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