Khimiia 10 Klass Rudzitis 2 Prakticheskaia Rabota May 2026

2CH3COOH+Na2CO3→2CH3COONa+H2O+CO2↑2 cap C cap H sub 3 cap C cap O cap O cap H plus cap N a sub 2 cap C cap O sub 3 right arrow 2 cap C cap H sub 3 cap C cap O cap O cap N a plus cap H sub 2 cap O plus cap C cap O sub 2 up arrow Step B: Identifying Polyhydric Alcohols (e.g., Glycerol)

Carboxylic acids can be identified by their acidity or their reaction with carbonates. Add a drop of litmus or a small amount of Na2CO3cap N a sub 2 cap C cap O sub 3 to the sample. Observation: Litmus turns red; Na2CO3cap N a sub 2 cap C cap O sub 3 produces effervescence (bubbles of CO2cap C cap O sub 2 Equation: khimiia 10 klass rudzitis 2 prakticheskaia rabota

Polyhydric alcohols react with copper(II) hydroxide at room temperature. Add freshly prepared to the test tube. Add freshly prepared to the test tube

The blue mixture changes to yellow and then forms a brick-red precipitate ( Cu2Ocap C u sub 2 cap O Equation (for acetaldehyde): The blue precipitate dissolves, forming a bright blue

✅ Through the systematic application of qualitative reagents, we successfully identified the organic compounds. The experiment demonstrates that the chemical properties of functional groups allow for the precise differentiation of substances within different homologous series.

The blue precipitate dissolves, forming a bright blue (cornflower blue) transparent solution.