63. What mass of Ba(IO3)2 (487 g/mol) (Ksp = 1.57 × 10-9) can be dissolved in 400.0 mL of water at 25℃? (A) 0.732 mg (B) 5.45 mg (C) 0.142 g (D) 0.178 g (E) 0.280 g

63. What mass of Ba(IO₃)₂ (487 g/mol) (Ksp = 1.57 × 10^-9) can be dissolved in 400.0 mL of water at 25℃?
(A) 0.732 mg
(B) 5.45 mg
(C) 0.142 g
(D) 0.178 g
(E) 0.280 g

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統計： A(1), B(4), C(6), D(0), E(2) #2241236

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II. Choose one correct answer for the following questions61. Which one is CORRECT for buffer capacity of a solution? (A) It is defined as the number of moles of a strong acid or a strong base that cause 1 mL of the buffer to undergo a 1.00-unit change in pH. (B) It depends only on the total concentration of buffers, not on their concentration ratio. (C) The pKa of the acid chosen for a given application should lie within ± 1 unit of the desired pH for the buffer. (D) A buffer solution of any desired pH can be prepared by combining calculated quantities of buffer pair, no need any adjustment. (E) Dissociation constants would not interfere with the predicted pH values.

63. What mass of Ba(IO3)2 (487 g/mol) (Ksp = 1.57 × 10-9) can be dissolved in 400.0 mL of water at 25℃? (A) 0.732 mg (B) 5.45 mg (C) 0.142 g (D) 0.178 g (E) 0.280 g

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63. What mass of Ba(IO₃)₂ (487 g/mol) (Ksp = 1.57 × 10^-9) can be dissolved in 400.0 mL of water at 25℃?
(A) 0.732 mg
(B) 5.45 mg
(C) 0.142 g
(D) 0.178 g
(E) 0.280 g