44. option C is the answer. as it is the mixture of salt and strong base. 45. op

Question

44. option C is the answer. as it is the mixture of salt and strong base.

45. option B is the answer.

46. [OH-] = 2 * 0.010 = 0.020 M

POH = - log (0.020) = 1.7

PH = 14 - 1.7 = 12.3

PH = 12.3

option A is the answer.

47.

PbCl2 .....> Pb2+ + 2 Cl-

..................s ..........2s M

KSp = s * (2s)2 = 3.6 * 10^-8

4 s3 = 3.6 * 10^-8

s = 2.08 * 10^-3 M

option B is the answer.

48. option B is the answer.

49. option B is the answer due to minimie the common ion effect.

50. option B is the answer because equilibrium shift towards right direction.

Explanation / Answer

44 Which of these combinations of substances would not givebuffer ? A) acetic acid and sodium acetate (R) ammonia and ammonium chloride (C) sodium chloride and sodium hydroxide (D) potassium carbonate and potassium bicarbonate Salt AgC AgBr Agl Ag Cro 45. For the molar 1.34 x 10 7.07 x 10- 9.11 10-9 6.69 × 10-5 solubilities shown which salt has the largest K? (A) AgBr (B) AgCi (C) Agl (D) Ag Cro 46. Calculate the pH of a 0.010 M solution of Ba(OH) (A) 12.30 (B) 12.00 (C) 2.00 (D) 1.70 47, [Substance-K-125 what is the solubility of lead(II) fluoride in waterPbF at 25°C? 3.6 x 10 (A) 3.3 x 10 mol/L (C) 1.9 × 10-4 mol/L (B) 2.1 x 10 mol/L (D) 3.6 x 10- mol/L 48. When dissolved in water, metal ions (A) donate an electron pair and function as Lewis acids. (B) donate an electron pair and function as Lewis bases. (C) accept an electron pair and function as Lewis acids. (D) accept an electron pair and function as Lewis bases. 49. Calcium hydroxide is sparingly soluble in water. Compare the relative solubilities of Ca(OH)2 in equal volumes of 0.10 M Ca(NO,2 and pure water. (A) Ca(OH)2 has the same solubility in both. (B) Ca(OH2 is more soluble in pure water. (C) Ca(OH), is more soluble in 0.10 M Ca(NO3)2. () There is not enough information to make a comparison 50. The precipitation of PbCl2 is exothermic. If an equilibrium mixture is cooled, which statement is true? (A) The amount of PbCl2(s) decreases. (B) The amount of PbC2(s) increases. (C) The concentration of Pb?(a) increases. (D) The concentration of Cl(a) remains constant.

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