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Question

Which of the following mixture of solutions has pH = 1.0 ?

Options

A.100 mL HCl + 100 mL NaOH

B.55 mL HCl + 45 mL NaOH

C.10 mL HCl + 90 mL NaOH

D.75 mL HCl + 25 mL NaOH

Solution

HCl    +   NaOH → NaCl + H₂O
M₁V₁   M₂V₂
(A) 10 10 Complete neutralization
   pH = 7
(B) 5.5 4.5 [H⁺] =
                 pH = 2
(C) 1 9 [OH^-] =
                 pH = 12.9
(D) 15 5 [H⁺] =
                 pH = 1

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