CHEMISTRY PRACTICAL 34 DISCUSSION

[Wamiqktk]

PLZ DISCUSS ABOUT PRACTICAL HERE!

 

[ahlam yume]

are we supposed to discuss it now? o.o

 

[Wamiqktk]

What were the possible ions present in FB6?

 

[Wamiqktk]

PLZ TELL ME that was aqueous ammonia supposed to be added in excess to FB6 or 1cm3 was to be added???

 

[happyperson]

PLZ TELL ME that was aqueous ammonia supposed to be added in excess to FB6 or 1cm3 was to be added???

I added 1 cm first then i added in excess.

 

[happyperson]

What were the possible ions present in FB6?

Sulfate, sulphite, zinc, magnesium, aluminium and lead.

 

[-Asad_Haider-]

Sulfate, sulphite, zinc, magnesium, aluminium and lead.

Not sulfite

 

[happyperson]

Not sulfite

But sulphite also gives a white ppt with Ba2+ and the result was positive.

 

[Wamiqktk]

what about NO2???
Nitrite??

 

[Wamiqktk]

PLZ TELL ME that was it written that add ammonia in excess??? No ! this means that we had to add only 1cm3 of ammonia not in excess !!

 

[Wamiqktk]

AND WHAT REAGENT DID U USE IN THE LAST PART TO DISCARD ONE OF THE CATION???

 

[ahlam yume]

for the possible ions present in fb6 i wrote al3+, mg2+ and so42- and i used aqueous naoh as the reagent to remove one of the cation

 

[Alihayatlak]

what were the ions in fb7?
i wrote iodide carbonate and cloride
cloride becasue we added agno3 to the solid and added ammonia so it dissolved.. im not sure if zinc is right though because youve added agno3 already...idk you tell

 

[-Asad_Haider-]

But sulphite also gives a white ppt with Ba2+ and the result was positive.

the salt was added to nitric acid in the preparation so if there had been any sulfite so2 whould have been liberated so it can't be sulfite and also if there had been a possibility of two anions there would have been further tests to ensure which one was present.

 

[Wamiqktk]

^^^^^^^^^^^^^^u already knew the INSTRUCTIONS THEN!!!!! Y DIDNT U TELL US

 

[Wamiqktk]

was it written that add ammonia in excess TO FB6??? No ! this means that we had to add only 1cm3 of ammonia not in excess !!
SO IT WAS POSSIBLE TO HAVE ZN IONS IN FB6

 

[ahlam yume]

for fb7 i wrote zn2+,co32- and iodide ion

 

[Wamiqktk]

AHLAM U R RIGHT FB7 CONTAINED THESE IONS BUT PLZ ANS MY QUESTION was it written that add ammonia in excess TO FB6??? No ! this means that we had to add only 1cm3 of ammonia not in excess !!
SO IT WAS POSSIBLE TO HAVE ZN IONS IN FB6

 

[-Asad_Haider-]

^^^^^^^^^^^^^^u already knew the INSTRUCTIONS THEN!!!!! Y DIDNT U TELL US

the question paper stated this!

 

[samantha liyanage]

what were the ions in fb7?
i wrote iodide carbonate and cloride
cloride becasue we added agno3 to the solid and added ammonia so it dissolved.. im not sure if zinc is right though because youve added agno3 already...idk you tell

it was zinc,carbonate and iodide :/