Electrólisis del Sulfato de Cobre

Electrólisis cuantitativa con electrodos de cobre

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

Objetivo

Realizar la electrólisis cuantitativa de una solución de sulfato de cobre usando electrodos de cobre y verificar la primera ley de electrólisis de Faraday.

Antecedentes

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.

Advertencias de seguridad

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

EPP requerido

goggles gloves lab_coat

Materiales

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

Equipamiento

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

Procedimiento

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

Resultados esperados

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%.

Limpieza

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

Detalles

Categoría
Electrochemistry
Dificultad
Intermediate (High School)
Duración
50 min
Costo estimado
$12,00
Pasos
7
Materiales
2

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Frequently Asked Questions

What is the objective of Electrólisis del Sulfato de Cobre?
Realizar la electrólisis cuantitativa de una solución de sulfato de cobre usando electrodos de cobre y verificar la primera ley de electrólisis de Faraday.
How difficult is Electrólisis del Sulfato de Cobre?
This experiment is rated as Intermediate (High School). It takes approximately 50 minutes to complete.
What safety precautions are needed for Electrólisis del Sulfato de Cobre?
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 Electrólisis del Sulfato de Cobre?
The main materials required are: Copper(II) sulfate (CuSO₄), Copper strips (2).
What results should I expect from Electrólisis del Sulfato de Cobre?
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%.