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Topic: Dissolution of potassium alum  (Read 2514 times)

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Offline eatstyrofoam

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Dissolution of potassium alum
« on: September 22, 2010, 04:25:36 AM »
When potassium alum, KAl(SO4)2 is dissolved in water, it does not yield any pure Al3+ ions, however is it something like KAln+ + (SO4)n-2 ?

It's been a while since I studied chemistry, so I'm unable to find the correct charge transfers here, but I'm very curious about this compound, since I prefer it over regular deodorants based on AlCl3, purely because Al is an accumulated poison.  ::)
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Offline Borek

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Re: Dissolution of potassium alum
« Reply #1 on: September 22, 2010, 04:47:01 AM »
Alum dissociates into Al3+.

As far as I am aware there are no hard proofs that Al present in deodorants is dangerous. It is investigated, but if there are no conclusive answers in first several years of the research, that usually means risks are so small they can be safely ignored  - your chances of dying in a car accident are much higher.
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Offline AWK

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Re: Dissolution of potassium alum
« Reply #2 on: September 22, 2010, 07:42:29 AM »
Quote
since I prefer it over regular deodorants based on AlCl3
Deodorants do not contain AlCl3 which solution is to acidic for skin.
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