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Edexcel IAL Chemistry 16.6 Core Practical 12 electrochemical cells

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.

16.6—CORE PRACTICAL 12 Investigating some electrochemical cells 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 16.6—CORE PRACTICAL 12 Investigating some electrochemical cells 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 16.6—CORE PRACTICAL 12 Investigating some electrochemical cells question 1 — Edexcel A-Level Chemistry A2
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