Flashcards
Qualitative Test
Flashcards do conjunto (11)
- 1Titration is __Quantitative
- 2Carbonate Test (3)CO2 gas will form
XCO3 + 2HNO3 -> X(NO3)2 + H2O +CO2
If bubbles, continue adding until bubbling stops
Effervescence if CO2 - 3CO2 testCO2 + Ca(OH)2 -> CaCO3(S) + H2O(l)
- 4Sulfate Test(4)(i) BaSO4 insoluble in H2O
(iii) Ba2+ + SO42- -> BaSO4 (s)
(ii) use Ba(NO3)2 as Ba source
(iv) Filter to remove white BaSO4 precipitate - 5If intending to Halogen test sulfate compound what should your source of Ba be and why?Excess Ba(NO3)2, not BaCl2.
- 6Halide Test (3)(i) AgX INSOLUBLE in H2O
(ii) Add AgNO3(aq) to X-(aq)
(iii) Add NH3(aq) to test solubility of precipitate - 7Precipitate colour and NH3 solubilityCl- / White / sol. in dilute
Br- / cream / sol. in conc.
I- / Yellow / insoluble. - 8Formation of complex ion in this reactionAgCl + 2NH3 -> [Ag(NH3)2]Cl
- 9Sequence of anion testing. (3)1. CO3^2- test.
2. SO4^2- test
3. Halide test - 10Test for ammonium(5)NH4+ + OH- -> NH3(g) + H2O(l)
NH3 soluble in H2O
Warm, NH3 gas evolved
Test pH of gas
ammonia is alkaline -> Blue - 11Why this order?(3)SO4 and halide don't make bubbles w/ weak acid
BaCO3 white as well, need to test for carbonate first.
AgCO3 and AgSO4 are also insoluble and form precipitates.
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- O usuário eliminou as informações de disciplina FlashCards sobre Qualitative Test, criado por Usuário eliminado em 27-04-2018.
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- Criado por I Shouldn't be awake · 20 abr 2018
- Copiado por I Shouldn't be awake · 27 abr 2018
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