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Volumetric Analysis (Titration) | Week 13 Topics1 Quiz
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Qualitative Analysis II | Week 52 Topics1 Quiz
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Qualitative Analysis III | Week 63 Topics1 Quiz
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Qualitative Analysis IV - Anions | Week 71 Topic1 Quiz
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Petroleum II | Week 105 Topics1 Quiz
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Topic Content:
- Test for CO32-, SO32- and S2- using Dilute Acids
- The Brown Ring Test (NO3–)
- Dioxonitrate(III) Ion, NO2– Test
- Additional Confirmatory Test for Some Anions
- Hydrogen Trioxocarbonate(IV) Ion, HCO3–
- Iodide Ion, I–
- Sulphide Ion, S2-
Test for CO32-, SO32- and S2- using Dilute Acids
| Test | Observation | Inference |
| Dry sample or residue or solution + dil. HCl(aq) or H2SO4(aq) | Sample dissolved. Effervescence occurs, a colourless, odourless gas, which turns moist blue litmus red and lime water milky is liberated | Acidic gas present Gas is CO2 from CO32- or HCO3– |
| Dry sample or residue or solution + dil. HCl(aq) or H2SO4(aq) | Sample dissolved. Effervescence occurs. Colourless gas with a sharp irritating smell is given off. The gas turns potassium dichromate(IV) paper from orange to green | SO2(g) (from SO32-) is liberated |
| Dry sample or residue or solution + dil. HCl(aq) or H2SO4(aq) + KMnO4(aq) or K2Cr2O7(aq) | Purple colour of KMnO4(aq) turns colourless or orange colour of K2Cr2O7(aq) turns green | Reducing agent present |
| Dry sample or residue or solution + dil. HCl(aq) or H2SO4(aq) | Sample dissolved. Effervescence occurs. Colourless gas with a characteristic rotten egg smell is given off | H2S(g) from S2- present |
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