A-level Chem有關solution colour

Question

問題: Fe(NO3)3 (aq) is added to KI (aq) a brown solution is

formed. 我就唔明，Fe 3+ is reduced to Fe 2+ while I-

is oxidized to form iodine，咁個resulting solution 應該有

Fe 2+(green) and iodine (brown)。咁個resulting colour

應該係 green + brown 的混合色，咁點解會係brown呢?

(al 97 paper 1 2c (i)) 。類似問題仲有2000 paper1 4a (ii)等

Update:

咁即係話，如果個resulting solution 出咗兩隻有colour 的ions ，個

resulting colour 係決定於較深色果隻顏色。但假設如果resulting solution 出咗兩隻ions 分別為yellow and blue，咁係咪緑色呢？

Answer 1

Favorite Answer

因為 Fe2+其實係淺綠色，即係pale green，

而iodine就係啡色，而且係深色既。

咁因為brown深色過pale green，

所以加埋之後就只睇到深色個隻而睇唔到淺色。

Source(s): ME