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-   -   determination of Na2CO3 and NaOH in Zn/Ni elecrtolyte (http://chemistryhelpforum.com/showthread.php?t=146579)

ana Mar 28th 2018 08:09 AM

determination of Na2CO3 and NaOH in Zn/Ni elecrtolyte
 
Hi all,

my name is Ana and I am new hear. I work at chemical lab and I have a problem with determination amound of Na2CO3 in presens of NaOH in Zn/Ni electrolyte.

Could you help me?

The method who we use is:

1./ 5 ml of sample is add in 250 ml conical flack. Then we put 100 ml H20 and 2-3 drops of phph as an indicator. Titration with 1N HCl. ( v1)

2./5 ml of sample is add in 250 ml conical flack. Then we put 20 ml 10% BaCl2, 100 ml H2O and 2-3 drops phph. Titration with 1N HCl. (v2)

Calculation of results:

Na2CO3, g/l = ( V2*NHCl - V1*NHCl).21.2

NaOH, g/l = V2*NHCl * 8

When we send the sample in other lab the resulds were diferend. The amound of Na2CO3 was double. :(


THANK YOU!


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