To prepare chlorine from chloride ion a strong oxidizing agent is required. The dichromate ion, Cr₂O₇²⁻, is one example (Figure 21.35). Consult the table of standard reduction potentials (Appendix M), and identify several other oxidizing agents that may be suitable. Write balanced equations for the reactions of these substances with chloride ion.

Data given in Figure 21.35

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Figure 21.35 Chlorine preparation. Chlorine is prepared by oxidation of chloride ion using a strong oxidizing agent. Here, oxidation of NaCl is accomplished using K₂Cr₂O7 in H₂SO4. (The Cl₂ gas is bubbled into water in a receiving flask.) Cengage Learning/Charles D. Winters