37. Which species is/are present in a 1.0 M solution of aqueous HF? (A) HF molec

Question

37. Which species is/are present in a 1.0 M solution of aqueous HF? (A) HF molecules, H0* ions, F ions, and HO molecules (B) Only H,O ions, F ions, and HiO molecules (C) Only HF molecules and H:O molecules (D) Only HF molecules 38. Order these species in terms of increasing base strength: ch, F, NH2 39. What would form the least acidic aqueous solution? (A) HBr (B) H,Se (C) GeHs (D) AsHs At 25 C, what is the pH of a 0.023 M Ba(OH), solution? (A) 12.66 (B 12.36 (C) 1.64 (D) 134 40. 41. At 25°C, what is the pH of a 0.50 M solution of hypochlorous acid (HOCl)? (A) 0.30 (B) 3.88 K. (HOCl)-3.5x10-8 (C) 7.46 (D) 7.76 42. Which acid is the weakest? (A) CH COOH (K-1.8x10) (B) HCN (K-4.9x10-10) (C) HNO: (K-4.5 10) (D) HOCI (K.= 3.5 x 10-8) Arrange the K, values for the acids HX, HY, and HZ from lowest to highest 43. 0 HX HY HZ 44. Which substance, when dissolved in water, will produce the solution with the lowest pH? (A) NaF (C) NH.CI (B) CaCl (D) NaCH,coo

Explanation / Answer

Q37

HF is weak acid, so expect hydrolysis

HF <-> H+ + F-

then

H+ + H2O = H3O+

therefore, exoect

HF, H3O+ and F- the most

choose A

Q38

base --> must accept H+

then

NH2- is the strongest base, to form NH3

then come sF- , will form HF

HCl is not likely to occur, therefore Cl- is the weakest base

choose D

Q39

note that AsH3 could accept H+, therefore, this is much more "basic" i.e. leat acidic than all others

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