PAG 9.2 - Lipids (Emulsion Test) Questions and Answers | Latest Version | 2024/2025 | Graded A+

PAG 9.2 - Lipids (Emulsion Test) Questions and Answers | Latest Version | 2024/2025 | Graded A+ **Why don't monosaccharides and disaccharides give false positives in emulsion tests?** Monosaccharides and disaccharides are soluble in polar solvents like water, but they do not dissolve in ethanol. **Why doesn't starch give false positives in the emulsion test?** Starch is insoluble, so it won't dissolve in either water or ethanol, remaining solid. **Why don't nucleic acids give false positives in the emulsion test?** Nucleic acids don't dissolve in ethanol due to their hydrogen bonds but are soluble in water, so no precipitates form. **Why don't proteins give false positives in the emulsion test?** Proteins are insoluble in ethanol, so they won't be extracted. **How can a qualitative emulsion test become fully quantitative?** A colorimeter can be used to measure light absorption and density, or by filtering and weighing the precipitate. **What color indicates the presence of lipids in an emulsion test?** Milky/white.