41 In a buffer system oHF and its salt NaF A the HF neutrali

41. In a buffer system oHF and its salt, NaF, A) the HF neutralizes added acid B) the HF neutralizes added base C) the HF is not necessary D) the F-neutralizes added H20 E) the F-neutralizes added base -42 which of the following is the strongest acid? A) H3P04 B) NH4 C) NaOH D) H2CO3 E) HCI 43. Which of the following statements correctly describes the hydronium-hydroxide balance in the given solution? A) In acids, [OH-] is greater than [H30+]. B) In bases, [O ]-[H30.]. C) In neutral solutions, [H3O]-H2O]. D) In bases, [OH-J is greater than [Hyo]. E) In bases, [OH-1 is less than [H3o*] 44. For Kw, the product of [H3O+] and [CH-J is- A) 1.0 x 10-14 B) 1.0 x 10-7 C)1.0 x 10-1 D) 1.0 E)1.0×1014 -45. What is the [H3 in a solution with [OH-j-1x 10-12 M? A)1 x 10-12 M B) 1 × 102 M C) 1 x 10-7 M D) 1 x 10-8 M E)1×10-2 M -46. What is the [OH-J in a solution that has a [H3oJ-1 × 10-6 M? A)1×10-2 M B)1×10-6 M C)1 x 10-8 M D)1 x 10-10 M E) 1 x 10-12 M

Solution

41. B) The HF neutralizes added base

42. A) H₃PO₄ (Phosphoric acid is the strongest acid amongst the given)

43. D) In bases, [OH^-] is greater than [H₃O⁺]

44. A) K_w = 1.0 x 10^-14

45. [H₃O⁺] [OH^-] = 1.0 x 10^-14

[OH^-] = 1.0 x 10^-12 . So [H₃O⁺] = 1.0 x 10^-14 / 1.0 x 10^-12 = 1 x 10^-2 M Option E) is correct answer.

46. [OH^-] = 1.0 x 10^-14 / [H₃O⁺] = 1.0 x 10^-14 / 1 x 10^-6 = 1 x 10^-8 M option C) is correct answer.