I also realised that i need to take into account if the nail is pure iron or impure iron. Im pretty sure that the nails would be impure so they would rust more quicker than pure iron nails.

i found out about ferroxyl indicator solution wich contains potassium ferricyanide and phenolphthalein and this turns blue when it detected metal oxidation. so if i can get some (i hear there are is a gel that contains potassium ferricyanide) i could add some in the solution and compare each one.

Also i forgot to mention my hypothesis for the vinegar. the vinegar increases the conductivity of the water and is also acidic so i can assume this will speed up the rusting.

hypothesis

i figured out that rusting occurs due to contact with oxygen and water. so when iron reacts with oxygen of the air along with the presence of moisture which in turn forms a substance known as iron oxide.it is usually a red/brown colour. it is a slow chemical reaction which takes place over a period of time. and as im doing this experiemnt with other solutions , i predict that the nails in the vinegar and salt will rust faster than the others. this is because 'salt water accelerates rusting because it is an electrolyte solution and its ions are able to move freely between the sites of the oxidation and reduction half reactions.' so i guess that means there is an increased concentration of ions so its a better conductor.

With the distilled/boiled water, i think it will corrode slower as their is less oxygen present and for rust to occur there needs to be a reaction between oxygen and the iron, with the water.
oh and the reason i may be doing this experiment with the nails being fully submerged and also the nails being partially submerged is because i was wondering if rust occurs more above surface of the solution or in the solution.

Rust

ok so im going to use iron nails of the same size and observe the reactions with my solutions (in test tubes/glasses). for my solutions i've decided to maybe use sodium chloride (table salt) - maybe another one with half the amount of salt, tap water, water with no air present (boiled water), vinegar, no water (just air) and possibly for all these doin it with the nail partially submerged. The reason i chose sodium chloride and vinegar is to replicate what environment where rust is likely to occur. So sodiun chloride would replicate somewhere near the coast where there is sea-spray and the vinegar would represent acid-rain.

My aim will be to observe what situation will be necessary for corrosion to occur.
hopefully i will find out what causes iron to rust and describe the extent and colour of the rust.

so im probably going to weigh the nail first before putting it into the solutions for about 3 - 4 days and after rub the rust off and weigh it again to see the weight difference. might repeated it 2-3 times?

more science

possibly using iron as well as other different types of metals for the corrosion experiment. if i cant find other metals with the same surface area as the iron then i may decide to only do iron with different solutions.

thinking of maybe doing which filtration method is best?

IDEA

Thinking of doing my srp with something to do with the rusting of iron.