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Aims
Aims
To construct an electrochemical cell
To construct an electrochemical cell
To measure the electrode potential of a selection of electrochemical cells
To measure the electrode potential of a selection of electrochemical cells
A. Report & Analyse of Results
A. Report & Analyse of Results
1. Record the electrode potential (in a suitable way) for each of the five cells you set up.
2. Describe and discuss how your data compares to researched published data.
Things to consider CPAC 4b
Things to consider CPAC 4b
CPAC 4b – Obtains accurate, precise and sufficient data for experimental and investigative procedures and records this methodically using appropriate units and conventions.
· Record information in a table’s or appropriately
· Record all voltages to an appropriate degree of accuracy
Things to consider CPAC 5b
Things to consider CPAC 5b
CPAC 5b – Sources of information are cited demonstrating that research has taken place, supporting planning and conclusions
· Clearly identifies any material that is a direct quote as such.
· Uses research to discuss how their results compare to published data:
o In terms of voltage
o Using ideas of ranking of the cells in terms of pd measured
· Use research to support any conclusions drawn
· Compile a bibliography of texts from which material has been sourced in such a way that the reader may retrieve the information easily.
3. In the first cell you set up, the [Zn(s) | Zn2+(aq)] and [Cu2+(aq) | Cu(s)] system:
Eө cell = 1.10 V
Eө [Cu2+(aq) | Cu(s)] = +0.34 V
4. Use these values and the equation given in the ‘All the maths you need’ section to calculate Eө [Zn2+(aq) | Zn(s)].
Learning Tip
Learning Tip
To calculate Eө [Zn2+(aq) | Zn(s)], substitute the values given into the equation:
Eө cell = Eө right-hand half-cell − Eө left-hand half-cell
Eө cell = 1.10 V
Note that the concentration of silver nitrate is 0.1 mol dm−3 , which is different to the other solutions. It is particularly dangerous to handle 1.0mol dm−3 silver nitrate. The sample data shows the results for 1.0 mol dm−3 silver nitrate for you to compare.
Math you will require
Math you will require
Substitute numerical values into algebraic equations using appropriate units for physical quantities:
Eө cell = Eө right-hand half-cell − Eө left-hand half-cell
B. Evaluate your report by answering the questions
B. Evaluate your report by answering the questions
1. Calculate Eө [Fe2+(aq) | Fe(s)].
2. The electrode potential values for the cells you set up may be slightly different to theoretical values. Give a reason for this.
3. Give a reason why silver nitrate is not used as a 1.0 mol dm−3 solution. 4. [Mg2+(aq) | Mg(s)] can also be used as a half-cell. Describe a problem that might be observed with this system.
C. Evaluate your Practical by Completing the Form - so you know where you should aim to make improvements in future
C. Evaluate your Practical by Completing the Form - so you know where you should aim to make improvements in future
Required Resources
Required Resources
Core Practical 10 Student Evaluation.docxCore practical 10 - Student sheet.docxPage updated
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