What are the major species present in 0.250 M solutions of each of the following acids? Calculate the pH of each of these solutions.?

Question

a) HCl

b) HBr

c) HClO4

d) HNO3

Answer 1

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a) HCl → H{+} + Cl{-}

b) HBr → H{+} + Br{-}

c) HClO4 → H{+} + ClO4{-}

d) HNO3 → H{+} + NO3{-}

All four of these acids are strong, so the concentration of H{+} ions is the same as the concentration of the acid, so in all four cases the pH is:

- log 0.250 = 0.60