볼타 전지 기전력 측정

다양한 반전지 조합의 기전력 측정하기

Electrochemistry Advanced (University) 60 분 ~$25.00

목표

여러 갈바니 전지 조합의 기전력(EMF)을 측정하고 표준 환원 전위 값과 비교한다.

배경

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.

안전 경고

  • 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

필수 개인 보호 장비

goggles gloves lab_coat

재료

  • Zinc strip and 1M ZnSO₄ (100 mL)
  • Copper strip and 1M CuSO₄ (100 mL)
  • Lead strip and 1M Pb(NO₃)₂ (100 mL)
    Toxic
  • Tin strip and 1M SnCl₂ (100 mL)
  • KNO₃ salt bridge solution (200 mL)
    Saturated
  • Filter paper strips (10)
    For salt bridges

장비

Six 250 mL beakers High-impedance voltmeter or multimeter Wires with alligator clips Sandpaper

실험 절차

1

Sand all metal strips until shiny. Prepare 1M solutions of each metal salt in separate beakers.

5 분 Wear gloves for lead compounds
2

Prepare salt bridges by soaking filter paper strips in saturated KNO₃ solution.

3 분
3

Construct a Zn/Cu cell: connect with a salt bridge and measure the EMF with the voltmeter.

5 분
4

Construct a Zn/Pb cell and measure EMF.

5 분 Handle lead carefully
5

Construct a Zn/Sn cell and measure EMF.

5 분
6

Construct a Cu/Pb cell and measure EMF.

5 분
7

Construct a Sn/Cu cell and measure EMF.

5 분
8

Tabulate all results. Calculate theoretical EMF values using standard reduction potentials and compare with measured values.

15 분

예상 결과

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.

정리

Collect all lead-containing waste in designated containers. Dispose of copper waste separately. Rinse metal strips and store. Wash hands thoroughly.

세부 정보

카테고리
Electrochemistry
난이도
Advanced (University)
소요 시간
60 분
예상 비용
$25.00
단계
8
재료
6

더 많은 실험

황산구리 전기분해 50 min 다니엘 전지 제작 45 min 활동도 순서 확인 30 min 농도 전지 45 min 레몬 전지 20 min 구리 전기도금 60 min 물의 전기분해 40 min 녹 방지 방법 비교 30 min

Frequently Asked Questions

What is the objective of 볼타 전지 기전력 측정?
여러 갈바니 전지 조합의 기전력(EMF)을 측정하고 표준 환원 전위 값과 비교한다.
How difficult is 볼타 전지 기전력 측정?
This experiment is rated as Advanced (University). It takes approximately 60 minutes to complete.
What safety precautions are needed for 볼타 전지 기전력 측정?
Key safety precautions include: Lead compounds are toxic — handle with extreme care; Wear nitrile gloves throughout; Wash hands immediately if lead solution contacts skin.
What materials are needed for 볼타 전지 기전력 측정?
The main materials required are: Zinc strip and 1M ZnSO₄, Copper strip and 1M CuSO₄, Lead strip and 1M Pb(NO₃)₂, Tin strip and 1M SnCl₂, KNO₃ salt bridge solution.
What results should I expect from 볼타 전지 기전력 측정?
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.