Form 2 IS questions!

A) 硫酸(SULPHURIC ACID)，硝酸(NITRIC ACID)，鹽酸(HYDROCHLORIC ACID)

B) 如果濃度唔高應該係透明

C) i) 因為以上三種酸係腐蝕性的，如果進入消化道可能會做成化學燒傷。

ii) 將瓶中的溶液分別以dropper 滴在三張藍色石蕊試紙(blue litmus paper) 上，如果試紙轉為紅色，瓶中的溶液便是帶有酸性的。

D) 所貼上的標籤應顯示溶液具有腐蝕性

2011-05-24 18:38:09 補充：
Re Firzen:
NO2 gas is brown in colour,
BUT when NO2 dissolve and react with water to form nitric acid,
it will become COLOURLESS

2011-05-24 18:39:05 補充：
sorry, should be :
when NO2 dissolve and react with water to form nitric acid,
the resultant solution will become COLOURLESS

2011-05-24 18:40:17 補充：
and of course, NO2 is a brown gas

2011-05-26 18:21:10 補充：
THX for 知識就是力量's supplement.





To Firzen:
As in 知識就是力量's supplement.
Conc. HNO3 is yellow, but in my answer, I have stated my assumption that the solution has non-high concentration.
So, it doesn't matter that I say it is COLOURLESS.

Concentrated nitric acid is colourless. But when it exposes to light, the solution turns yellow due to the decomposition of nitric acid to give brown nitrogen dioxide, which dissolve in the solution to form a yellow solution.

HNO3唔係透明, 係 Brown colour, 因為有NO2 gas dissove左