問題詳情
1. 以重鉻酸鉀迴流法檢測水中化學需氧量，需在水樣內加入 2 至 3 滴菲囉啉(1,10-phenanthroline)指示劑後，再以硫酸亞鐵銨進行滴定，當滴定到達終點時之顏色變化為下列何者？
(A)由紫紅色變為藍色
(B)由橘黃色變為藍綠色
(C)由藍綠色變為紅棕色
(D)由紅棕色變為橘黃色
(A)由紫紅色變為藍色
(B)由橘黃色變為藍綠色
(C)由藍綠色變為紅棕色
(D)由紅棕色變為橘黃色
參考答案
無參考答案
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