Method

Firstly set your containers on the same surface, room/ temperature. Prepare the liquids onto a table in measuring cups. Then take out your pH scale and find out the acid levels. Next place the iron nails into the containers and measure the liquids to make sure they're the same amount. Make sure you know which liquid is which and pour them into the separate containers, then label the containers since its hard to tell which is which. Do not touch or turn the containers since it may mantle with the corroding processes. Look at the time to see when you poured in the liquids (vinegar, soda water, sprite/ fizzy) and so you know when to look back at the nails. After 1 day record what has happened to the nails and take a photo or explain it thoroughly. Keep this routine up for about 15-20 days and see what has happened.