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Profile

Chicky
teaches chemistry to noobs
likes to watch naruto & bleach
enjoys playing computer & PSP games

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PS3 + LCD TV for my room
Obtained SEDD by 2008

Chicky Tok

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Thursday, September 07, 2006

For those of you who did not pay attention during QA practical lessons and would like to have a try at the experiments again, here is yr chance. Want to introduce a website to u pple.

http://neon.chem.ox.ac.uk/vrchemistry/LiveChem/transitionmetals_content.html

The following reactions are more relevant to yr syllabus. You need to know how to account for the observations. Refer to yr QA notes if u r in doubt.

1) chromate(VI) + dilute hydrochloric acid [conversion of chromate(VI) to dichromate(VI) - not a redox reaction]

2) dichromate(VI) + sodium hydroxide [conversion of dichromate(VI) to chromate(VI)]

3) iron(II) + sodium hydroxide [formation of green ppt - iron(II) hydroxide]

4) iron(II) + dilute & concentrated ammonia [formation of green ppt - iron(II) hydroxide]

5) iron(III) + sodium hydroxide [formation of brown ppt - iron(III) hydroxide]

6) iron(III) + dilute & concentrated ammonia [formation of brown ppt - iron(III) hydroxide]

7) iron(III) + potassium thiocyanate [special test for iron(III) ions - forming blood red complex]

8) copper(II) + sodium hydroxide [formation of blue ppt - copper(II) hydroxide]

9) copper(II) + dilute & concentrated ammonia [formation of blue ppt, followed by soluble tetraamminecopper(II) complex which is deep blue in colour]

10) copper(II) + edta [complex formation - note that as edta^4- is a hexadentate ligand]

11) copper(II) + concentrated hydrochloric acid [note that the solution turns green becos of the presence of the blue hexaaquacopper(II) complex and the yellow tetrachlorocuprate(II) complex]

12) zinc(II) + sodium hydroxide [formation of white ppt - zinc hydroxide]

13) zinc(II) + dilute & concentrted ammonia [formation of white ppt, followed by soluble tetraamminezinc(II) complex]

Feel free to try out other reactions. Particularly safe for "laboratory terrorists" and "lords of destruction" - u noe who u r. Have fun.



[6:07 pm] chicky