Em quarta-feira, 26 de agosto de 2015 16:06:02 UTC-3, Poutnik  escreveu:   
   > Dne 26/08/2015 v 20:59 Poutnik napsal(a):   
   > > Dne 26/08/2015 v 20:08 :   
   > >   
   > > What about to produce standard solutions   
   > > by controlled dilution of Natrium hypochlorite - bleaching agent ?   
   > >   
   > > Than doing some simple comparative colorimetry   
   > > by dropping agents into tested water, min and max standard solution ?   
   > >   
   > With variant the tested water would be compared   
   > just toward coloured foils/glass/sealed tube,   
   > representing colour of min/max chlorine concentration.   
      
   That is the question.   
      
   Where I'll find a sodium hypochlorite solution with known concentration?   
      
   Sodium hypochlorite is usually sold to the end consumer in the form of Bleach   
   with active chlorine content in the range of 1.75 and 2.75% of active chlorine.   
      
   But this solution is very unstable.   
      
   I have tested a kit for colorimetric analysis used to monitor the chlorine   
   concentration in swimming pools. But I found very difficult to identify the   
   concentration from the color card scale and found that uncertainty is very   
   large.   
      
   I plan to measure the current during a time interval in a electrolysis of NaCl   
   solution and use the Faraday's law to calculate the amount of Cl2 produced.   
      
   What do you think about?   
      
   >   
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   > Poutnik ( the Czech word for a wanderer )   
   >   
   > Knowledge makes great men humble, but small men arrogant.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)