17.5 mL potassium permanganate stock solution 可稀釋成 1 L 1:5,000 solution。欲製備 400 mL stock solution,應秤取 potassium permanganate 多少公克?
(A)4
(B)8
(C)16
(D)32
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統計: A(4), B(6), C(14), D(1), E(0) #3972526
統計: A(4), B(6), C(14), D(1), E(0) #3972526
詳解 (共 5 筆)
#7511084
5 mL potassium permanganate stock solution 可稀釋成 1 L 1:5,000 solution
=>1g potassium permanganate : 5000 ml = 0.2g : 1000ml
5ml的stock solution內含0.2g potassium permanganate,400ml stock solution則需要
=>400ml/5ml*0.2g = 16g 的potassium permanganate
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