ACT Science Practice Question #1868 (Hard (540)) | Test Citadel
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ACT Science Difficulty: Hard (540)

Digital ACT Science Practice Question #1868

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Why was sodium sulfate (Na2SO4) added to the water rather than running current through pure deionized water? Experiment Context (Stoichiometry of Aqueous Water Electrolysis): Students passed DC electrical current through an aqueous solution of 0.10 M Na2SO4 using platinum electrodes in a Hoffman apparatus, collecting evolved gases in calibrated burettes: Table 38: - 5 min: Cathode Gas Volume = 12.4 mL; Anode Gas Volume = 6.2 mL; Ratio (Cathode:Anode) = 2.00 - 10 min: Cathode Gas Volume = 24.8 mL; Anode Gas Volume = 12.4 mL; Ratio = 2.00 - 15 min: Cathode Gas Volume = 37.2 mL; Anode Gas Volume = 18.6 mL; Ratio = 2.00 - 20 min: Cathode Gas Volume = 49.6 mL; Anode Gas Volume = 24.8 mL; Ratio = 2.00
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Electrolytes provide mobile ions to carry current in water.

Masterclass Solution & Distractor Trap Analysis

Pure water is a poor conductor; adding an inert strong electrolyte provides mobile ions to carry current....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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