Chemical Analysis Problem! Watch

Nator
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4) Some sodium hydroxide solution was added to a solution of substance E. A white precipitate formed which dissolved when more sodium hydroxide solution was added. Some sodium hydroxide solution was added to another sample of substance E. On warming there was no effect on damp red litmus paper. However, when aluminium powder was added, and again warmed, a gas was formed that turned red litmus paper blue.

a) Name and give the formula of substance E.
b) Identify the white precipitate.
c) Write an ionic equation for the formation of the white precipitate.


Any ideas people? None are mentioned on my sheet so I am asking here
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Nator
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BUMP! Anyone know?
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charco
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(Original post by Nator)
4) Some sodium hydroxide solution was added to a solution of substance E. A white precipitate formed which dissolved when more sodium hydroxide solution was added. Some sodium hydroxide solution was added to another sample of substance E. On warming there was no effect on damp red litmus paper. However, when aluminium powder was added, and again warmed, a gas was formed that turned red litmus paper blue.

a) Name and give the formula of substance E.
b) Identify the white precipitate.
c) Write an ionic equation for the formation of the white precipitate.


Any ideas people? None are mentioned on my sheet so I am asking here
OK, here's a little help.

NaOH precipitates hydroxides from their solutions. Group 1 hydroxides are soluble and do not precipitate. 'd' block metal hydroxides (except Zn) are coloured.

Amphoteric hydroxides redissolve in excess NaOH

The only (common) gas that turns litmus blue is ammonia...
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sohinder
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http://library.thinkquest.org/2923/tests.html

this will help
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ilyking
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http://lmgtfy.com/?q=solution+of+substance+E
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whyisthatcrazy
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a) Aluminium nitrate
b)Aluminum Hydroxide
c)Al^3+ (aq) + 3OH^1- (aq) --> Al(OH)3(s)

I think this all right.
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Marek Freitag
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Does anybody now where I could be able to find the answers to the worksheet? any help would be appreciated!
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charco
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(Original post by Marek Freitag)
Does anybody now where I could be able to find the answers to the worksheet? any help would be appreciated!
You do realise that this is a seven year old thread?
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Marek Freitag
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(Original post by charco)
You do realise that this is a seven year old thread?
Sorry, i just worked that one out!
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