@chemtales8: Cation Test Copper ion can also be tested using ammonia solution. Copper ion will also form blue precipitate with a few drops of ammonia solution. However this time, the blue precipitate can dissolve in excess ammonia solution. #igcse #chemistry #qualitativeanalysismethod #copper #qualitativeanalysis #saltidentification #stem #educational #cambridge #0620 #education #learningisfun #educationalpurpose #paper6 #alternativetopractical #chemistrywow