Determine the Determine the Determine the Post-lab Questions 1. Give the identit
ID: 1044066 • Letter: D
Question
Determine the Determine the Determine the Post-lab Questions 1. Give the identity of both your anion unknowns, and write balanced, net ionic equations for any reactions which confirmed the presence of the anions you reported for both your unknowns. Include not only equations for any confirmatory reactions, but also any equations from Parts A, B, and C that prove the presence of the ion(s) you are reporting. Unknown # ? Unknown # 21 hq yqa_ is y 60s Equations: A student added aqueous BaClz to a sample of an anion unknown. No precipitate formed. Next the student added 3M H:SO4, and no gas was evolved. Then the student added aqueous AgNOs to a sample of unknown in water and a precipitate formed. Then the student did the hafide confirmatory reaction and concluded that the unknown anion was chloride since the hexane layer was colorless. Comment on the student's conclusion. Another student got a precipitate upon addition of aqueous BaClz to a sample of an anion unknown. The precipitate dissolved in HNOs, along with effervescence Upon addition of 3M H2S04 to another fresh sample, a colorless, odorless gas was produced. When AgNOs was added to a third fresh sample of the unknown, a white precipitate formed which dissolved, with bubbling, upon addition of HNO What anion was present in the sample?Explanation / Answer
A
PPT MEANS PRECIPITATE
NO PPT WITH BaCl2 sulfate, phosphate, and oxalate will also form white precipitates. NOT PRESENT Cl- MAY BE PRESENT
NO gas evolved with H2SO4
PPT FORMED with AgNO3 Cl-, Br-,I-
HEXANE LAYER COLOURLESS Br- I- NOT PRESENT
AgCl is a
B
PPT UPON ADDITION OF BaCl2
which disolve in HNO3 WITH GAS EVVOLUTION (CO32-) MAY BBE PRESENT
The sulfate ion SO42- BaSO4. will not even dissolve in nitric acid.
sulfate, phosphate, and oxalate will also form white precipitates, but these ions do not produce any effervescence with nitric acid. SO42- , PO43-, (COO-)2 NOT PRESENT.
UPON ADDITION OF H2SO4 GAS RELEASE
WITH AgNO3 WHITE PPT FORMED(Br-,I- ) NOT PRESENT which disolve in HNO3 - Cl- not present
SO
Ag2(CO3) IS B
first anion is Cl- and second anion is (CO3)2-
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