Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to make iron oxide [title] Locate a source of iron (iii) (iron in the 3 + oxidation state). [step] An iron (iii) salt such as ferric chloride will be easy to add to the solution. It is often used for etching copper, so you can buy it online, at a chemical supply store, and sometimes even an electronics store.

Ending1: Also, a fine rust powder would work well. You can collect rust and grind it to a fine powder if you choose to go that route. Ending2: [title] Dissolve approximately 2 parts iron to 1 part water in a heavy stainless steel container. [title] Add 1-¼ cup of hydrogen peroxide or ammonia (1 g) to the mixture. Ending3: [title] Purchase an iron from a safe, obtainable source. [step] It should have a co2 level or higher with whatever it came from, as this is usually obtained from one source. Ending4: [title] Soak the cell a1 in water of the temperature of your choice. [step] Immediately place this cell in a pot with a few drops of hot water to soften it.

Answer format: ending1/ending2/ending3/ending4