Đo Điện Thế Pin Voltaic
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Đo sức điện động của các tổ hợp nửa pin khác nhau
Mục tiêu
Đo sức điện động (SĐĐ) của nhiều tổ hợp pin galvanic và so sánh với các giá trị thế khử chuẩn.
Bối cảnh
By constructing galvanic cells with different metal/metal-ion half-cell combinations and measuring their voltages, students can experimentally determine relative electrode potentials. Comparing measured values with standard reduction potentials validates electrochemical theory.
Cảnh báo an toàn
- Lead compounds are toxic — handle with extreme care
- Wear nitrile gloves throughout
- Wash hands immediately if lead solution contacts skin
- Dispose of lead waste in designated containers
PPE cần thiết
Vật liệu
-
Zinc strip and 1M ZnSO₄ (100 mL)
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Copper strip and 1M CuSO₄ (100 mL)
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Lead strip and 1M Pb(NO₃)₂ (100 mL)Toxic
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Tin strip and 1M SnCl₂ (100 mL)
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KNO₃ salt bridge solution (200 mL)Saturated
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Filter paper strips (10)For salt bridges
Thiết bị
Quy trình
Sand all metal strips until shiny. Prepare 1M solutions of each metal salt in separate beakers.
Prepare salt bridges by soaking filter paper strips in saturated KNO₃ solution.
Construct a Zn/Cu cell: connect with a salt bridge and measure the EMF with the voltmeter.
Construct a Zn/Pb cell and measure EMF.
Construct a Zn/Sn cell and measure EMF.
Construct a Cu/Pb cell and measure EMF.
Construct a Sn/Cu cell and measure EMF.
Tabulate all results. Calculate theoretical EMF values using standard reduction potentials and compare with measured values.
Kết quả dự kiến
Zn/Cu: ~1.10 V, Zn/Pb: ~0.63 V, Zn/Sn: ~0.62 V, Cu/Pb: ~0.47 V, Sn/Cu: ~0.48 V. Measured values should be within 0.05-0.15 V of theoretical due to non-standard conditions.
Dọn dẹp
Collect all lead-containing waste in designated containers. Dispose of copper waste separately. Rinse metal strips and store. Wash hands thoroughly.
Chi tiết
- Danh mục
- Electrochemistry
- Độ khó
- Advanced (University)
- Thời gian
- 60 phút
- Chi phí ước tính
- $25,00
- Số bước
- 8
- Vật liệu
- 6