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Which of the following substances is the most acidic?
a substance that has a pH of 7
a substance that has a pH of 2
a substance that has a pH of 8
a substance that has a pH of 5

Answer :

pH=-lg[H+]

from the formula of the pH you can deduct that the lower the pH the more hydrogen protons are released. The easier it is for a compound to release protons the more acidic it is. Therefore the correct answer is a substance that has a pH of 2