Ionic EquilibriumHard
Question
Which of the following solution will have a pH exactly equal to 8 ?
Options
A.10-8 M HCl solution at 25oC
B.10-8 MH+ solution at 25oC
C.2 × 10-6 M Ba(OH)2 solution at 25oC
D.10-5 M NaOH solution at 25oC
Solution
(A) At 25oC, [H+] in a solution of 10-8 M HCl > 10-7 M.
(25oC, 10-8 M HCl [H+] > 10-7 M )
(B) [H+] = 10-8 M.
(C) [OH-] = 4 × 10-6 M ⇒ [H+] = 2.5 × 10-9 M.
(D) [H+] = 10-9 M.
(25oC, 10-8 M HCl [H+] > 10-7 M )
(B) [H+] = 10-8 M.
(C) [OH-] = 4 × 10-6 M ⇒ [H+] = 2.5 × 10-9 M.
(D) [H+] = 10-9 M.
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