Question

How many grams of perchloric acid are dissolved into 3.86 L of water, if the pH of the solution is 4.03.

Answer 1

perchloric acid ( HClO4 )

HClO4 --- > H + + ClO4-
pH = 4.03 = > [ H + ] = 10 ^ -4.03
n ( HClO4 ) = V [ H + ]
m ( HClO4 ) = 100,5.V . [ H + ] = 100,5.3,86.10 ^ -4.03 = 0.03620373409 ...