Domain: Chemistry / apparatus_usage

turn: 1
modality: text
input: Which of the following substances are white solids at room temperature, highly soluble in water, and exhibit strong alkalinity (pH > 12 in aqueous solution)?
Options:
A. Sodium chloride (NaCl)
B. Calcium carbonate (CaCO₃)
C. Sodium hydroxide (NaOH)
D. Sulfur (S₈)
E. Potassium hydroxide (KOH)
F. Silicon dioxide (SiO₂)
G. None of the above
output: answer: C, E

turn: 2
modality: image
input: The target substance is one of the correct options from the previous question. It is a strongly alkaline solid that is highly hygroscopic and deliquescent, readily absorbing moisture and carbon dioxide from the air. 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 is correct: a tightly sealed, wide-mouth glass or plastic reagent bottle with a screw cap or ground glass stopper.

2. The substance generated is indeed sodium hydroxide (NaOH), appearing as white, opaque, spherical pellets or flakes (not a fine powder). This substance is one of the correct options from turn 1 (C and E).

3. The substance is correctly contained within the sealed bottle, with no visible signs of moisture absorption or caking. The bottle is appropriately filled (e.g., 3/4 full).

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

turn: 3
modality: image
input: We will refer to the substance you identified earlier as the 'target substance'. In a titration experiment to determine the concentration of an unknown hydrochloric acid solution using this target substance as the titrant, the instrument 'burette' is used. Please generate an image depicting the correct usage of this instrument during the titration setup. The background is a clean laboratory bench.
output: evaluation_points: 1. The correct instrument, a burette, is generated. It is shown clamped vertically to a retort stand, positioned above an Erlenmeyer flask containing the analyte solution.

2. The reaction setup corresponds to an acid-base titration. The burette should be filled with a clear, colorless solution (representing the standardized sodium hydroxide (NaOH) titrant). The Erlenmeyer flask contains a solution (e.g., with a pH indicator like phenolphthalein, which would be colorless in acid).

3. The burette's stopcock is in the closed position initially. The burette tip is positioned just inside the mouth of the Erlenmeyer flask to prevent splashing. The initial volume reading (e.g., 0.00 mL or another value) is visible on the burette scale.

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, judge which of the following statements about this instrument and its usage norms are correct:
Options:
A. This instrument is primarily used for precise measurement and delivery of variable volumes of liquid.
B. When filling the instrument, a funnel should always be used to avoid spillage.
C. Before use, the instrument must be rinsed with the solution it will contain to ensure concentration accuracy.
D. The final volume reading should be taken from the bottom of the meniscus for aqueous solutions.
E. Air bubbles trapped in the tip must be removed before starting a titration.
F. This instrument can be used to store concentrated alkaline solutions like sodium hydroxide for long periods.
G. None of the above
output: answer: A, C, D, E