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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: badguyinvn on April 11, 2017, 12:05:06 PM

Title: Silver precipitate
Post by: badguyinvn on April 11, 2017, 12:05:06 PM

Hi, my English is rather bad. If you don't understand what I say, I'm sorry. :'( :'( :'(
I had a problem with my experiment. In a tube, I added 4-5 drops of AgNO3 solution to 4-5 drops of NaCl 5% solution.
Then, I added NH4OH solid until AgCl precipitate was dissolved completely. Lastly, I kept on adding 2 drops of KI 10%. I had thought I would be received a yellow precipitate, which was KI. But the precipitate was white, I couldn't understand why it was. So, anyone helps me, please.

Title: Re: Silver precipitate
Post by: Corribus on April 13, 2017, 09:54:49 AM

Freshly prepared KI is white, not yellow. It yellows with age due to slow production of elemental iodine when in contact with air.

Title: Re: Silver precipitate
Post by: Borek on April 13, 2017, 09:58:01 AM

KI or AgI? I think OP means the latter and - if memory serves me well - it already precipitates yellow.

Title: Re: Silver precipitate
Post by: Corribus on April 13, 2017, 11:55:55 AM

Ah, well I guess it helps if you read the whole post. :)