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Answer to Question #42076 in Other Chemistry for TONE

Question #42076
Dear sir
in determination H2S in crud oil we used Borax solution 30% to extract H2S from crud oil to borax then acidify with HCl then titration with iodine and thiosulfate sodium.
i want to know why i use Borax ?because i can use NaOH or another base that cheaper of borax
Best regrds
TONE
Expert's answer
The highly basic solution can cause the oil hydrolysis and thus can affect the obtained result.

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Comments

Assignment Expert
07.05.14, 11:36

Normally, hydrogen sulfide is separated from oil, hence oil cannot affect on its determination. However, if the strong base is used for extraction, some part of oil can turn into carbonic acid salt and therefore remain in the mixture used for further determination.

tone
05.05.14, 15:57

DEAR SIR
OUR ARTICLE IS ABOUT CRUDE OIL THAT MIXTURE OF PARRAFIN NAPHTHENE AROMATIC &ASPHALTENE.AND OUR PURPOUSE IS NOT FAT OIL OR OTHER OILS.
THEREFORE CRUD OIL IS MIXTURE OF UNSATURATED AND ...I THINK USE OF BORAX IS ANOTHER REASON.CAN YOU ANOTHER REASON ?
BEST REGARDS

Assignment Expert
05.05.14, 14:44

The iodine can react with unsaturated carbon chain of carbon acid salt. This reaction can consume the significant amounts of iodine, so that the measured amount of iodine will be larger than necessary for reaction with H2S.

TONE
05.05.14, 13:07

DEAR SIR
I THINK IF HYDROLYSIS HAPPENED THE PRODUCT ARE GLYCEROL & SODIUM SALT,THIS PRODUCT DO NOT REACTION WITH IODINE ,THEN CAN YOU EXPLAIN ME WHAT PRODUCT INTERFERE WITH IODINE OR OTHER REACTANT IN THIS REACTION?
BEST REGARDS
TONES

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