CONCLUSION

From the observations made we can conclude that water and air (Oxygen) are necessary for the rusting of the nails.Rust contains mainly Iron (III) oxide which is hydrated, Fe2O3. XH2O

Although rusting occurred in boiling tube 1 and 4 it occurred much faster in tube 5 containing salty water.Salt accelerates the rate of rusting.Note: Salt is not a condition for rusting.Rusting destroys machinery, equipment and roofs made of iron. Prevention of rusting is therefore of great importance