The Spectrophotometric Determination of Copper(II) Ion with 7-Bromo-2-Nitroso-1-Oxinaphthalene-3,6-Disulphocid: Spectrophotometric Determination of Copper(II) Ion with 7-Bromo-2-Nitroso-1-Oxinaphthalene-3,6-Disulphocid. IJC. 2024;63(5):500-505. doi:10.56042/ijc.v63i5.9289