Abstract
An activity for hydrogen cyanide detection in bitter seeds is presented. The procedure is based on the absorption of hydrogen cyanide (HCN) from a mixture of chopped seeds into a ninhydrin or tetramminecopper(II) complex solution followed by their reaction. A qualitative experiment is proposed in order to demonstrate the presence of HCN in bitter seeds and to visualize metal–cyanide reduction and formation of an interesting mixed valence copper amino–cyanide complex: Cu3(NH3)4(CN)4.
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