Elektrolyse von Kupfersulfat

Quantitative Elektrolyse mit Kupferelektroden

Electrochemistry Intermediate (High School) 50 Min. ~$12,00

Ziel

Eine quantitative Elektrolyse einer Kupfersulfatlösung mit Kupferelektroden durchführen und das erste Faraday'sche Gesetz der Elektrolyse bestätigen.

Hintergrund

When copper sulfate solution is electrolyzed with copper electrodes, copper is deposited at the cathode and dissolved from the anode. By measuring mass changes and current, Faraday's law can be verified: the mass of substance deposited is proportional to the charge passed.

Sicherheitswarnungen

  • Copper sulfate is toxic if ingested
  • Wear gloves when handling solutions
  • Handle electrical connections with dry hands

Erforderliche PSA

goggles gloves lab_coat

Materialien

  • Copper(II) sulfate (CuSO₄) (200 mL)
    1M solution
  • Copper strips (2) (2 pieces)
    Similar size, sanded clean

Ausrüstung

DC power supply (1-5V) Ammeter Beaker (400 mL) Wires Analytical balance Timer Sandpaper

Durchführung

1

Sand both copper strips until shiny. Wash with distilled water and dry. Weigh each strip accurately on the analytical balance.

5 Min.
2

Pour 200 mL of 1M CuSO₄ into the beaker.

2 Min. Wear gloves
3

Connect the circuit: power supply → ammeter → anode (Cu strip) → solution → cathode (Cu strip) → power supply.

5 Min.
4

Set the power supply to give a steady current of about 0.5 A. Record the exact current.

2 Min.
5

Run the electrolysis for exactly 20 minutes, monitoring the current.

20 Min.
6

Turn off the power supply. Carefully remove both electrodes, rinse with distilled water, dry, and reweigh.

5 Min.
7

Calculate the charge passed (Q = I x t). Calculate theoretical mass deposited using Faraday's law: m = (M x Q) / (n x F). Compare with actual mass change.

8 Min.

Erwartete Ergebnisse

The cathode should gain mass and the anode should lose approximately the same mass. At 0.5 A for 20 min: Q = 600 C, theoretical mass = (63.55 x 600) / (2 x 96485) = 0.197 g. Measured value should be within 10%.

Aufräumen

Dispose of copper sulfate solution in heavy metal waste. Rinse and store copper strips. Clean the beaker and equipment.

Details

Kategorie
Electrochemistry
Schwierigkeit
Intermediate (High School)
Dauer
50 Min.
Geschätzte Kosten
$12,00
Schritte
7
Materialien
2

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Frequently Asked Questions

What is the objective of Elektrolyse von Kupfersulfat?
Eine quantitative Elektrolyse einer Kupfersulfatlösung mit Kupferelektroden durchführen und das erste Faraday'sche Gesetz der Elektrolyse bestätigen.
How difficult is Elektrolyse von Kupfersulfat?
This experiment is rated as Intermediate (High School). It takes approximately 50 minutes to complete.
What safety precautions are needed for Elektrolyse von Kupfersulfat?
Key safety precautions include: Copper sulfate is toxic if ingested; Wear gloves when handling solutions; Handle electrical connections with dry hands.
What materials are needed for Elektrolyse von Kupfersulfat?
The main materials required are: Copper(II) sulfate (CuSO₄), Copper strips (2).
What results should I expect from Elektrolyse von Kupfersulfat?
The cathode should gain mass and the anode should lose approximately the same mass. At 0.5 A for 20 min: Q = 600 C, theoretical mass = (63.55 x 600) / (2 x 96485) = 0.197 g. Measured value should be within 10%.