Re: Sedimentation in NaOH 20%

From: "Farooq W" <farooq.w@xxxxxxxxx>
Date: 22 Sep 2006 10:34:39 -0700

tancho wrote:

We have made a solution of 20% NaOH.
After several weeks ayellow/brown sediment is formed in the solution.
The raw materials used are PH.EUR grade.

I have tested te Iron content : 0,5 ppm and the Na2CO3 content : 0,3%

What can cause this sedimentation ?

Many possibilities ... I guess. Sodium carbonate tends to settle out in
concentrated alkaline solutions. Iron (III) could be imparting its
brown color on the Na2CO3 precipitates. What is the container made of?

.

References:
- Sedimentation in NaOH 20%
  - From: tancho

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Re: Sedimentation in NaOH 20%
... After several weeks ayellow/brown sediment is formed in the solution. ... The raw materials used are PH.EUR grade. ... If the container is glass then some insoluble sodium silicate compound that probably also contains sodium carbonate ...
(sci.chem)
Sedimentation in NaOH 20%
... We have made a solution of 20% NaOH. ... After several weeks ayellow/brown sediment is formed in the solution. ... The raw materials used are PH.EUR grade. ...
(sci.chem)