Edexcel A-Level Chemistry A2 16.3 The Standard Electrode Potential Eo Is Measured in Conditions of I 298 K Temperature Ii 100 Kpa Pressure of Gases Iii Questions

Practise Edexcel IAL Chemistry 16.3 by selecting standard gas pressure and ion concentrations and calculating solution masses or dilutions for standard half-cells.

Exam points

Select 100 kPa hydrogen pressure and 1 mol dm^-3 ion conditions for standard cells.
Calculate solution concentrations or masses needed to prepare a standard half-cell.

[Maximum number: 1]

An electrochemical cell is made from the electrode systems shown by these half-equations.

\begin{aligned} \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} & \rightleftharpoons \mathrm{Ag}(\mathrm{~s}) & E^{\ominus}=+0.80 \mathrm{~V} \\ \mathrm{VO}_{2}^{+}(\mathrm{aq})+2 \mathrm{H}^{+}(\mathrm{aq})+\mathrm{e}^{-} & \rightleftharpoons \mathrm{VO}^{2+}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) & E^{\ominus}=+1.00 \mathrm{~V} \end{aligned}

The apparatus used to measure the value for $E_{\text {cell }}^{\ominus}$ under standard conditions is shown.

Figure for Question Edexcel A-Level Chemistry A2 16.3 The Standard Electrode Potential Eo Is Measured in Conditions of I 298 K Temperature Ii 100 Kpa Pressure of Gases Iii Questions question 1 — Edexcel A-Level Chemistry A2

The electrolyte in the right-hand half-cell is prepared using equal volumes of

$1 \mathrm{~mol} \mathrm{dm}^{-3}$ acidified $\mathrm{VO}_{2}^{+}(\mathrm{aq})$ and $1 \mathrm{~mol} \mathrm{dm}^{-3}$ acidified $\mathrm{VO}^{2+}(\mathrm{aq})$

$2 \mathrm{~mol} \mathrm{dm}^{-3}$ acidified $\mathrm{VO}_{2}^{+}(\mathrm{aq})$ and $2 \mathrm{~mol} \mathrm{dm}^{-3}$ acidified $\mathrm{VO}^{2+}(\mathrm{aq})$

$1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{VO}_{2}^{+}(\mathrm{aq})$ and $1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}(\mathrm{aq})$

$1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{VO}^{2+}(\mathrm{aq})$ and $1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}(\mathrm{aq})$

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Edexcel A-Level Chemistry A2 16.3 The Standard Electrode Potential Eo Is Measured in Conditions of I 298 K Temperature Ii 100 Kpa Pressure of Gases Iii Questions question 1