LEVEL 2 CLEARANCE // BENCH RUN

OBJECTIVE 2 — SYNTHESIZE & MEASURE

Agent — your ΔG analysis picked the route. Now the prediction meets the bench. You will synthesize Prussian blue in the double-wall calorimeter and let the thermometer tell us whether this reaction pushes energy into its surroundings.

SELECTED REACTION3 FeSO₄·7H₂O (aq) + 2 K₃[Fe(CN)₆] (aq) → Fe₃[Fe(CN)₆]₂ (s) + 3 K₂SO₄ (aq) + 7 H₂O (l)

The full bench protocol is in your mission memo — this terminal is your field notebook. Log the stabilized starting temperature and the maximum temperature after mixing, then work the calculation chain down to the entropy change of the water surroundings, ΔS_water. I will pull crystal-size measurements from your product for the next objective.

Gloves, goggles, and a lab coat at all times. Tomović needs the data, not another casualty. Download the PDF report for your mission file, and report your findings through the mission memo in Canvas.

Rodney — ITE Field Analyst

Table 1 — Prussian blue synthesis data

Log both temperatures from your probe, then work each calculation. In a Value cell you can either type the math with your numbers — like =15-10, then press Enter and the calculated value takes its place — or calculate it yourself and type the answer. Click a row's ƒ button to see its equation.

Given: mass of water = 40 g · specific heat of water = 4.2 J/(g·°C) · reaction amount = 0.0030 mol

Table 1. Prussian blue synthesis data — measured temperatures and calculation chain
Description	Value	Units
1.3 · Baseline — ferrous sulfate
Solution starting temperature, T_initial		°C
1.4 · Reaction — add potassium ferricyanide
Solution final (maximum) temperature, T_final		°C
Step 2 · Entropy change of the water surroundings
Temperature change, ΔT ƒ ΔT = T_final − T_initial		°C
Kinetic energy transferred into the water, q_water ƒ q_water = 40 g × 4.2 J/(g·°C) × ΔT		J
Kinetic energy per mole of reaction ƒ q per mole = q_water ÷ 0.0030 mol		J/mol
Average temperature of the reaction ƒ T_average = (T_initial + T_final) ÷ 2		°C
Average temperature of the reaction, in kelvin ƒ T_average (K) = T_average (°C) + 273		K
Entropy change of the water surroundings, ΔS_water ƒ ΔS_water = q per mole ÷ T_average (K)		J/(K·mol)

FIELD OBSERVATIONS · OPTIONAL

Notebook space — color change, when the solid appeared, anything unusual. Included in your PDF report.