Domain: Chemistry / precipitation

turn: 1
modality: image
input: Generate a concise chemical laboratory bench scene: A <correct and appropriate laboratory container type> contains a substance. This substance must have the following observable appearance: <color + physical state (solid/liquid/gas) + form (powder/lump/crystal/solution, etc.) + optional luster/transparency>. Do not include the substance name, chemical formula, or element symbols. The background should be a <laboratory environment: bench surface, outlines of basic equipment, avoid clutter and text labels>.
output: evaluation_points: 1. The container generated in the image is correct and is indeed a <conical flask with a stopper>.

2. The color and appearance of the target substance (colorless, clear, liquid solution) conforms to the described morphological features.

3. The substance is correctly contained in the flask, with the stopper in place, and the volume is appropriate (e.g., filling about half the flask).

4. The background is a simple laboratory bench scene.

turn: 2
modality: text
input: Based on the appearance of the substance in the input image, and given that this substance is known to have the following properties: 1) It is a volatile alkaline solution with a characteristic pungent odor. 2) It can react with acids to form salts. 3) It is highly soluble in water. Please select from the following options the substance it most likely is:

A. Concentrated sulfuric acid (H₂SO₄, a viscous, oily liquid)
B. Sodium hydroxide solution (NaOH(aq), a colorless, clear, viscous alkaline solution)
C. Ammonia solution (NH₃·H₂O, a colorless, clear, volatile alkaline solution)
D. Ethanol (C₂H₅OH, a colorless, clear, volatile liquid with a characteristic alcoholic odor)
E. None of the above
output: answer: C

turn: 3
modality: image
input: Generate a test tube containing a solution prepared from the target substance you identified earlier. After adding reagent B = <copper(II) sulfate solution (CuSO₄, 0.1 M)> to it, a precipitate forms inside the test tube. Describe the precipitate using its appearance characteristics (color, state); do not directly or indirectly give its name. The background is a laboratory bench.
output: evaluation_points: 1. The test tube and liquid volume are reasonable, with the liquid level at about one-third of the tube's height.

2. The color of the precipitate satisfies <deep blue>.

3. The state of the precipitate satisfies <gelatinous or amorphous>.

4. The solution color is reasonable. After the precipitation reaction, the solution should appear <colorless or very pale blue>.

The image background is a simple laboratory bench, consistent with the background in Turn 1's output image.

turn: 4
modality: text
input: Based on the precipitation phenomenon shown in the input image, if an 'excess' of reagent C = <concentrated ammonia solution (NH₃·H₂O)> is added and the state is allowed to stabilize, the most likely observation is:

A. The deep blue precipitate dissolves completely, forming a clear, deep blue solution.
B. The deep blue precipitate remains unchanged, settling at the bottom of the test tube.
C. The deep blue precipitate changes color to a brown solid.
D. The deep blue precipitate dissolves partially, leaving a lighter blue suspension.
E. None of the above
output: answer: A