Domain: Chemistry / apparatus_usage

turn: 1
modality: text
input: Which of the following substances are consistent with the description: 'A white solid powder at room temperature, slightly soluble in water, and its aqueous solution exhibits strong alkalinity'?

Options:
A. Sodium chloride (NaCl)
B. Calcium hydroxide (Ca(OH)₂)
C. Sulfur powder (S)
D. Copper(II) sulfate pentahydrate (CuSO₄·5H₂O)
E. Sodium carbonate (Na₂CO₃)
F. Calcium oxide (CaO)
G. None of the above
output: answer: B, E

turn: 2
modality: image
input: It is known that the target substance is one of the correct options from the previous question and satisfies the following additional condition: 'This substance is commonly used in construction and agriculture, and its saturated aqueous solution is known as limewater.' Please generate an image showing this target substance stored correctly in its proper container and placed on a laboratory bench.
output: evaluation_points: 1. The container generated in the image is correct: a tightly sealed, wide-mouth glass reagent bottle or a plastic container with a screw cap, clearly labeled.

2. The substance generated is indeed calcium hydroxide (slaked lime), appearing as a fine, dry, white powder. The color and physical form (powder) must be clearly depicted.

3. The substance is stored correctly in the sealed container to prevent it from absorbing moisture and carbon dioxide from the air, which would cause caking. The amount shown should be appropriate, filling a portion of the container.

4. The background is a clean, uncluttered laboratory bench scene.

turn: 3
modality: image
input: We will subsequently refer to the substance you identified earlier as the 'target substance.' When preparing a saturated aqueous solution of this target substance (for use in tests for carbon dioxide), the laboratory instrument 'filter funnel and filter paper' is used. Please generate an image depicting the correct use of this instrument in this scenario. The background is a clean laboratory bench.
output: evaluation_points: 1. The image correctly depicts the laboratory instrument: a glass filter funnel placed in an iron ring or on a funnel stand, with a piece of folded filter paper properly fitted inside the funnel.

The operation shown is the filtration of a suspension. The reaction mixture should consist of a cloudy, white suspension of the target substance (calcium hydroxide) in water being poured into the funnel to separate the undissolved solid from the saturated limewater solution.

3. The use of the filter funnel and filter paper conforms to standard laboratory practice: the funnel stem touches the inner wall of the receiving beaker to prevent splashing, and the filter paper is folded correctly (e.g., a fluted or simple fold) to facilitate filtration.

4. The background is a clean, uncluttered laboratory bench scene.

turn: 4
modality: text
input: Based on the instrument and operational scene in the input image, determine which of the following statements regarding this instrument and its usage norms are correct:

Options:
A. Filter paper should be folded into a cone shape that fits snugly against the funnel wall to maximize filtration speed.
B. The tip of the funnel stem should be positioned away from the wall of the receiving vessel to allow air to escape and prevent pressure buildup.
C. For filtering hot saturated solutions, a hot water funnel or a jacketed funnel is recommended to prevent premature crystallization in the stem.
D. The mixture to be filtered should be poured directly onto the center of the filter paper to ensure even distribution.
E. When filtering a corrosive liquid, a Büchner funnel connected to a vacuum flask is a more suitable alternative to gravity filtration.
F. The primary purpose of filtration in this specific scenario is to obtain a pure, saturated solution of the target substance by removing its undissolved solid residue.
G. None of the above
output: answer: A, C, E, F