Domain: Chemistry / apparatus_usage

turn: 1
modality: image
input: Generate a concise chemical laboratory bench scene: A substance is contained in a glass reagent bottle with a ground-glass stopper. The substance must appear as a colorless, clear liquid. The background should be a simple laboratory bench with basic equipment outlines, avoiding clutter and text labels.
output: evaluation_points: 1. The generated container is correct: a glass reagent bottle with a ground-glass stopper.

2. The target substance's color and appearance (a colorless, clear liquid) matches the description.

3. The substance is appropriately contained in the bottle, with a suitable fill level (e.g., not overflowing).

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 has the following properties: (1) It is a weak acid with a characteristic pungent odor. (2) It is miscible with water, ethanol, and diethyl ether. (3) Its pure form freezes at approximately 16.6°C. Which of the following substances is it most likely to be?

Options:
A. Concentrated Sulfuric Acid (H2SO4)
B. Ethanol (C2H5OH)
C. Acetone (CH3COCH3)
D. Acetic Acid (CH3COOH)
E. None of the above
output: answer: D

turn: 3
modality: image
input: We will now refer to the substance you identified previously as the 'target substance'. In a laboratory procedure to determine the concentration of this target substance via titration with a standard sodium hydroxide solution, an instrument called a burette is used. Please generate an image depicting the correct use of this instrument in such a titration setup. The background should be a simple laboratory bench.
output: evaluation_points: 1. The image correctly depicts a burette, and its placement (e.g., clamped vertically on a stand above a conical flask) is reasonable.

The reaction setup is consistent with an acid-base titration: a conical flask (presumably containing the target acid (acetic acid, CH3COOH) and an indicator like phenolphthalein) is positioned under the burette (presumably containing NaOH solution).

The burette's use conforms to standard practice: the stopcock is accessible for control, the tip is inside the receiving flask's opening to avoid splashing, and the initial volume reading is visible.

The background is a simple laboratory bench scene, consistent with the background style from Turn 1's input description.

turn: 4
modality: text
input: Based on the instrument and operational scene in the input image, judge which of the following statements about this instrument (a burette) and its usage standards are correct.

Options:
A. It is primarily used for the precise measurement and delivery of variable volumes of liquid, especially in titrations.
B. Before filling with the titrant, it should be rinsed with the titrant solution to avoid dilution errors.
C. When reading the meniscus, the eye should be level with the bottom of the meniscus to avoid parallax error.
D. It is acceptable to forcefully drain the last drop from the tip by blowing air into the burette.
E. The zero mark is always at the top for all burette designs.
F. Air bubbles trapped in the tip must be removed before starting the titration to ensure volume accuracy.
G. None of the above are correct.
output: answer: A, B, F