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Edexcel A-Level Chemistry A2 16.6 Core Practical 12 Investigating Some Electrochemical Cells Questions

For practical cell questions, label both half-cells, show the salt bridge and voltmeter, then explain how soaked filter paper lets ions move.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Draw a standard cell with labelled electrodes, solutions, salt bridge and voltmeter.
  • Describe a salt bridge as filter paper soaked in KNO3 or another suitable electrolyte.
  • Correct apparatus errors such as a power supply, wrong electrode or missing salt bridge.

Edexcel A-Level Chemistry A2 16.6 Core Practical 12 Investigating Some Electrochemical Cells Questions question 1

[Maximum number: 3]

This question is about copper and some of its compounds.

An electrochemical cell was made from the electrode systems represented by these half-equations:

Cu2+(aq)+2e−⇌Cu( s)E⊖=+0.34 VFe3+(aq)+e−⇌Fe2+(aq)E⊖=+0.77 V\begin{array}{ll} \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{~s}) & E^{\ominus}=+0.34 \mathrm{~V} \\ \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Fe}^{2+}(\mathrm{aq}) & E^{\ominus}=+0.77 \mathrm{~V} \end{array}

A student drew a diagram of an experiment to measure the standard emf of the cell.

Figure for Question Edexcel A-Level Chemistry A2 16.6 Core Practical 12 Investigating Some Electrochemical Cells Questions question 1 — Edexcel A-Level Chemistry A2

Identify three mistakes in this diagram and the changes needed to correct them.

Assume that standard conditions were used.

Table for Question Edexcel A-Level Chemistry A2 16.6 Core Practical 12 Investigating Some Electrochemical Cells Questions question 1 — Edexcel A-Level Chemistry A2
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