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Online Passage Notes

Online Passage Notes - formation of a single coordinate...

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Oxidation state of chlorine is 0 on the left. In HCl, chlorine has a -1 oxidation state (implying that it has been reduced). In HOCl, an overall neutral molecule, we know H always has an oxidation state of +1, and oxygen will have a -2 charge, making Cl have a +1 oxidation state. Thus, chlorine is both oxidized and reduced. The passage indicates that chloroamine increases the solubility of lead by forming coordination complexes. Coordination complexes are the consequence of a Lewis acid–base reaction between the ligand and the metal ion. Each ligand donates a nonbonding pair of electrons towards the
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Unformatted text preview: formation of a single coordinate covalent bond. The availability of the lone pair will dictate how easily the complex will form. At low pH, the lone pairs of ligands such as chloroamine are readily protonated by all of the free H + : ClH 2 N : + H + → (ClH 2 N–H) + . Therefore, at low pH (= high [H + ]) most of the chloroamine will be protonated and unable to complex with metal ions. Thus, [complex] will decrease with decreasing pH (choice C ). An electrolyte is a compound that dissolves in water to produce many ions. All ionic compounds, strong acids and strong bases are strong electrolytes ....
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