This is how I will test my question

I will see what kind of acid has the most affective effect on a nail. I will do this by getting 3 containers the same compacity and add the same amount of millilitres of a acidic substance into the containers. After I have added the liquids, I will measure the pH levels of the acid, then put in an iron nail into the containers. I will then record the amount of corrosion corrosion the acid had caused. I will record it for 20 days.