[K313]

Hi, I am planning to make some ferrofluid in a highschool lab and this is the procedure I have made. Would anybody have some recommendations for me or possible things which could cause errors? I took the procedure from here. Thank you for any help.

Materials:
- Ammonia, 150ml
- Oleic Acid, 5ml
- Ferric Chloride Solution (FeCl3), 30ml of 1.5M
- Steel Wool
- Distilled Water
- Kerosene
- Heat Source
- Beakers
- Measuring cups
- Filter paper

Procedure

Making the Magnetite
1. Pour 10ml of Ferric Chloride Solution (FeCl3) (1.5M) and 10ml of distilled water into a cup (Total FeCl3 concentration of 0.75M)
2. Add a piece of steel wool (fully covered)
The solution should become bright green (FeCl2 is formed)
3. Filter the liquid
    - Keep the filtrate, discard residue

Precipitate the magnetite out of solution by :
4. Adding 20ml of the  Ferric Chloride Solution (FeCl3 1.5M) to the green solution (FeCl2).
    - they react in a 2:1 ratio
5. Stir in 150ml of ammonia
    - The magnetite (Fe3O4) should fall out of the solution

Suspending the Magnetite in a carrier
6. Heat the Magnetite-Ammonia solution just below boiling
7. Stir in 5ml of Oleic acid
8. Wait until Ammonia evaporates (1hr roughly)
9. Remove mixture from heat and wait to cool
    - Heat allows oleate to enter solution while ammonia exits
10. Add 100ml of Kerosene
    - If a substitute for Kerosene is used: must dissolve oleic acid but not uncoat magnetite
11. Decant and save the Kerosene layer
    - Discard Water
12. The Kerosene layer is the Ferrofluid

[K313]

By "here" at the top of the original post, I meant https://www.thoughtco.com/how-to-make-liquid-magnets-606319
Was supposed to embedded