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How to Measure EMF of a Cell - AQA A Level Chemistry Practical 8

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Laila

05/02/2023

Chemistry

Required Practical 8

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Chemistry

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Physical chemistry

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Electrode potentials and electrochemical cells (a-level only)

How to Measure EMF of a Cell - AQA A Level Chemistry Practical 8

Measuring EMF of Electrochemical Cells - A comprehensive practical guide for determining electromotive force using different metal electrodes and calculating result accuracy against standard EMF values.

• The practical focuses on EMF of cell in Electrochemistry through various metal combinations
• Detailed setup includes copper as a constant electrode against zinc, aluminum, iron, and magnesium
• Results show varying accuracy levels, with zinc being most accurate (0.01V difference) and aluminum showing largest deviation (0.61V)
• Key control variables include solution volumes and consistent use of copper electrodes
• Risk assessment emphasizes proper handling of chemicals and safety measures

...

05/02/2023

1339

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

View

Equipment and Materials for EMF Measurement

This page lists the equipment and materials needed for the EMF of cell in Electrochemistry practical. It provides a comprehensive inventory for students to prepare before the experiment.

Key items include: • Metal electrodes: Copper, zinc, aluminium, iron, and magnesium • Solutions: CuSO4, ZnSO4, AlSO4, FeSO4, and MgSO4 all1moldm−3all 1 mol dm-3 • Voltmeter and connecting wires • Salt bridge materials: Filter paper, KNO3 solution, petri dish

Highlight: The use of various metal electrodes allows for the comparison of different electrochemical cells.

Vocabulary: Propanone - Another name for acetone, used for degreasing metal electrodes.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

View

Experimental Procedure for Measuring EMF

This section outlines the step-by-step method for measuring the EMF of an electrochemical cell. The procedure ensures accurate and consistent results.

Key steps include:

  1. Cleaning and degreasing metal electrodes
  2. Preparing half-cells with appropriate solutions
  3. Creating a salt bridge using filter paper soaked in KNO3
  4. Connecting the half-cells and measuring voltage

Example: For a copper-zinc cell, use CuSO4 solution for the copper half-cell and ZnSO4 solution for the zinc half-cell.

Highlight: Proper positioning of the salt bridge is crucial for accurate EMF measurements.

Vocabulary: Half-cell - One of the two parts of an electrochemical cell, consisting of an electrode and its surrounding electrolyte.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

View

Risk Assessment for EMF Measurement Practical

This page presents a detailed risk assessment for the AQA A level Chemistry required practical 8, focusing on safety precautions when handling chemicals and glassware.

Key hazards and preventive measures include: • Aluminium sulphate: Can cause eye damage; wear splash-proof goggles • Zinc: Potential fire hazard in powder form; use eye protection • Propanone: Highly flammable and irritant; ensure good ventilation and avoid skin contact • Magnesium: Flammable solid; use eye protection • Copper sulphate: Toxic to aquatic life; wear protective equipment • Glassware: Risk of cuts; handle with care

Highlight: Proper personal protective equipment PPEPPE and careful handling are essential for safe experimentation.

Example: When using propanone for degreasing, ensure no naked flames are present and the laboratory is well-ventilated.

Vocabulary: Risk assessment - A systematic process of evaluating potential risks in an experimental procedure and identifying ways to minimize them.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

View

This practical guide provides students with a comprehensive understanding of how to calculate EMF of a cell in A Level Chemistry. By following these instructions, students can safely and accurately measure the EMF of various electrochemical cells, gaining valuable hands-on experience in electrochemistry.

Highlight: This practical reinforces key concepts in electrochemistry while developing essential laboratory skills.

Vocabulary: Electromotive force EMFEMF - The maximum potential difference between two electrodes of an electrochemical cell.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

View

Page 5: Data Analysis and Calculations

Contains adjusted EMF values and comparison with standard values.

Highlight: All measurements are adjusted relative to the standard hydrogen electrode using copper's standard potential +0.34V+0.34V.

Example: Zinc showed excellent accuracy with only 0.01V difference from standard values.

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Subjects

Chemistry

Physical chemistry

Electrode potentials and electrochemical cells (a-level only)

 

Chemistry

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5 Feb 2023

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6 pages

How to Measure EMF of a Cell - AQA A Level Chemistry Practical 8

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Laila

@lailaaa__

Measuring EMF of Electrochemical Cells - A comprehensive practical guide for determining electromotive force using different metal electrodes and calculating result accuracy against standard EMF values.

• The practical focuses on EMF of cell in Electrochemistry through various metal combinations... Show more

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

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Equipment and Materials for EMF Measurement

This page lists the equipment and materials needed for the EMF of cell in Electrochemistry practical. It provides a comprehensive inventory for students to prepare before the experiment.

Key items include: • Metal electrodes: Copper, zinc, aluminium, iron, and magnesium • Solutions: CuSO4, ZnSO4, AlSO4, FeSO4, and MgSO4 all1moldm−3all 1 mol dm-3 • Voltmeter and connecting wires • Salt bridge materials: Filter paper, KNO3 solution, petri dish

Highlight: The use of various metal electrodes allows for the comparison of different electrochemical cells.

Vocabulary: Propanone - Another name for acetone, used for degreasing metal electrodes.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

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Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Experimental Procedure for Measuring EMF

This section outlines the step-by-step method for measuring the EMF of an electrochemical cell. The procedure ensures accurate and consistent results.

Key steps include:

  1. Cleaning and degreasing metal electrodes
  2. Preparing half-cells with appropriate solutions
  3. Creating a salt bridge using filter paper soaked in KNO3
  4. Connecting the half-cells and measuring voltage

Example: For a copper-zinc cell, use CuSO4 solution for the copper half-cell and ZnSO4 solution for the zinc half-cell.

Highlight: Proper positioning of the salt bridge is crucial for accurate EMF measurements.

Vocabulary: Half-cell - One of the two parts of an electrochemical cell, consisting of an electrode and its surrounding electrolyte.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

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Join milions of students

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Risk Assessment for EMF Measurement Practical

This page presents a detailed risk assessment for the AQA A level Chemistry required practical 8, focusing on safety precautions when handling chemicals and glassware.

Key hazards and preventive measures include: • Aluminium sulphate: Can cause eye damage; wear splash-proof goggles • Zinc: Potential fire hazard in powder form; use eye protection • Propanone: Highly flammable and irritant; ensure good ventilation and avoid skin contact • Magnesium: Flammable solid; use eye protection • Copper sulphate: Toxic to aquatic life; wear protective equipment • Glassware: Risk of cuts; handle with care

Highlight: Proper personal protective equipment PPEPPE and careful handling are essential for safe experimentation.

Example: When using propanone for degreasing, ensure no naked flames are present and the laboratory is well-ventilated.

Vocabulary: Risk assessment - A systematic process of evaluating potential risks in an experimental procedure and identifying ways to minimize them.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

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This practical guide provides students with a comprehensive understanding of how to calculate EMF of a cell in A Level Chemistry. By following these instructions, students can safely and accurately measure the EMF of various electrochemical cells, gaining valuable hands-on experience in electrochemistry.

Highlight: This practical reinforces key concepts in electrochemistry while developing essential laboratory skills.

Vocabulary: Electromotive force EMFEMF - The maximum potential difference between two electrodes of an electrochemical cell.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

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Page 5: Data Analysis and Calculations

Contains adjusted EMF values and comparison with standard values.

Highlight: All measurements are adjusted relative to the standard hydrogen electrode using copper's standard potential +0.34V+0.34V.

Example: Zinc showed excellent accuracy with only 0.01V difference from standard values.

Required Practical 8: Measuring the EMF of a Cell Introduction: Aim: To find the EMF of different cells using different metals to act as ele

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Introduction to Measuring EMF of Electrochemical Cells

This section introduces the aim and hypothesis of the AQA A Level Chemistry required practical 8. The goal is to measure the EMF of different cells using various metal electrodes and compare the results with standard values.

Definition: An electrochemical cell is a device that converts chemical energy into electrical energy through redox reactions.

The document explains that cell voltage depends on chemical composition under ideal conditions. It also describes the notation for electrochemical cells and the importance of salt bridges.

Example: Znss | Zn2+aqaq || Cu2+aqaq | Cuss represents a zinc-copper cell.

Highlight: Salt bridges allow ion movement between electrodes, completing the circuit. They are typically made of filter paper soaked in a salt solution like potassium nitrate.

The page includes a diagram of an electrochemical cell, illustrating the components and their arrangement.

Vocabulary: EMF ElectromotiveForceElectromotive Force - The potential difference between two electrodes in an electrochemical cell.

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Samantha Klich

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Thomas R

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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

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Sudenaz Ocak

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Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

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