Qualitative Test

Pregunta	Respuesta
Titration is __	Quantitative
Carbonate Test (3)	CO2 gas will form XCO3 + 2HNO3 -> X(NO3)2 + H2O +CO2 If bubbles, continue adding until bubbling stops Effervescence if CO2
CO2 test	CO2 + Ca(OH)2 -> CaCO3(S) + H2O(l)
Sulfate 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
If intending to Halogen test sulfate compound what should your source of Ba be and why?	Excess Ba(NO3)2, not BaCl2.
Halide Test (3)	(i) AgX INSOLUBLE in H2O (ii) Add AgNO3(aq) to X-(aq) (iii) Add NH3(aq) to test solubility of precipitate
Precipitate colour and NH3 solubility	Cl- / White / sol. in dilute Br- / cream / sol. in conc. I- / Yellow / insoluble.
Formation of complex ion in this reaction	AgCl + 2NH3 -> [Ag(NH3)2]Cl
Sequence of anion testing. (3)	1. CO3^2- test. 2. SO4^2- test 3. Halide test
Test 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
Why 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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	Creado por I Shouldn't be awake hace más de 6 años