問題詳情
1.小明想獲得重量百分比為40 %的NaOH 濃溶液，下列哪種配法最接近他的需求？
(A)取40 g NaOH 固體加入60 ml 純水中，攪拌至全溶
(B)取40 g NaOH 固體加入少量的純水完全溶解後，再加純水至總體積為100 ml
(C)取40 g NaOH 固體加入100 ml 純水中，攪拌至全溶
(D)取23 g NaOH 固體加入少量的純水完全溶解後，再加純水至總體積為100 ml
(A)取40 g NaOH 固體加入60 ml 純水中，攪拌至全溶
(B)取40 g NaOH 固體加入少量的純水完全溶解後，再加純水至總體積為100 ml
(C)取40 g NaOH 固體加入100 ml 純水中，攪拌至全溶
(D)取23 g NaOH 固體加入少量的純水完全溶解後，再加純水至總體積為100 ml
參考答案
答案：A
難度：適中0.4
統計：A(16),B(20),C(2),D(1),E(0)
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