[무기공업화학]알루미늄의 정량

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무기공업분석실험 칼륨명반 중의 알루니늄의 정량 예비 레폿 입니다~~

목차

1.Date
2.Title
3.Purpose&Principle
4.Used reagent & tools
5.Procedure

본문내용

1.Date 2006. 10. 2

2.Title
-7․3 Fixed quantity of aluminium in potassium alum

3.Purpose&Principle
Add ammonium hydroxide in potassium alum solution(), then formed precipitation of aluminum hydroxide

act a base and an acid at the hands of a positive compound ,then it can melt in alkali and acid. So special attention to too much heating. This separate and heating, then it become aluminum oxide.

has hygroscopicity, so it need heating hardly such that 1200℃ or more.

4.Used reagent & tools
(1) tools
watch glass
beaker(300ml)
funnel
funnel stand
crucible
crucible tongs
desiccator
drying machine
scales
5.Procedure
(1)Weigh 0.5g of potassium alum (put in the beaker) +Add 100ml of D.W and heating
(2) Add 50ml 1N + drops of methyl red solution. And heating until reach a boiling point. discoloration point : pH4.2(red)~6.2(yellow)
(3) drop of 6N ammonia water and stir. If) the color changed from red to yellow, boiling 1~2 minutes. and filtrate.
(4)After filtrate, wash with 2%

참고 자료

무기공업분석실험,/ 박용성, 우제완, 황영애 공저