13367208
Descrição
FlashCards por I Shouldn't be awake, atualizado more than 1 year ago
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Criado por I Shouldn't be awake
mais de 6 anos atrás
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| Questão | Responda |
| 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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