Question

In the electrolysis of aqueous nabr, which substance is first produced at the anode?

Answer 1

NaBr is a soluble salt. When you dissolve the solid in water it will first separate the íons: Na+ interact and is surrounded by about 6 water molecules, and could be now represented by [Na.6H2O]+, still a positive íon; the Br- will also separate from the Na+ and interact with water molecules (typically 4–6), forming the [Br.nH2O]-, a negative íon.

What is produced at the anode in aqueous electrolysis?

Oxygen is produced (from hydroxide ions), unless halide ions (chloride, bromide or iodide ions) are present.

In that case, the negatively charged halide ions lose electrons and form the corresponding halogen.

Thus, this the answer.

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