Sunday
December 21, 2014

Homework Help: Chemistry - more advice needed thanks

Posted by candy on Tuesday, September 21, 2010 at 4:56pm.

I obtained a lot of dirty brown ppt the moment the mixture was poured into AgNO3 solution. Does this mean my NaOH sample contains a lot of chlorides? Could other silver halides be present?

However for my control solution of 50ppm sodium chloride solution,a cloudy white ppt was obtained after standing for a while.

Please advise how should I conduct the test?


Posted by candy on Tuesday, September 21, 2010 at 4:05pm.


This is a test for chlorides in NaOH sample.
1.0g of NaOH was dissolved in 5ml of distilled water, acidified with 4ml of dilute nitric acid and diluted to 15ml with distilled water. This mixture was poured into a test tube containing 1ml of AgNO3 solution.
However, I obtained a dirty brown ppt. Do you have any idea what the problem might be?
Thanks.




Chemistry - help - bobpursley, Tuesday, September 21, 2010 at 4:12pm
Yes. You did this in light, the silver chloride is photosenstive, it darkens when exposed to light. Brown is not unusual (dark bluish, with slight yellow).

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - pls help - This is a limit test for chlorides. 1.0g of NaOH sample ...
Chemistry -thanks - Hi,there was an error with the procedure. 1.0g NaOH sample ...
Chemistry - help - This is a test for chlorides in NaOH sample. 1.0g of NaOH was...
chemistry - A sample of 7.83 grams of NaOH is dissolved into 620 mL of aqueous 0...
chemistry - A sample of 6.65 grams of NaOH is dissolved into 621 mL of aqueous 0...
Chemistry - A sample of 6.41 grams of NaOH is dissolved into 675 mL of aqueous 0...
Chemistry - A sample of 9.4 grams of NaOH is dissolved into 693 mL of aqueous 0....
Chemistry - A sample of 8 grams of NaOH is dissolved into 599 mL of aqueous 0....
Chemistry - A sample of 7.52 grams of Na OH is dissolved into 675 mL of aqueous ...
ap chem - A sample of 7.45 grams of NaOH is dissolved into 609 mL of aqueous 0....

Search
Members