Physical Chemistry: Understanding our Chemical World 1st. Edition by Paul M. S. Monk | 9780471491804 | 0471491802 | Holooly

Physical Chemistry: Understanding our Chemical World

219 SOLVED PROBLEMS

Question: 7.18

Determine a value for the standard electrode potential E^O Ag^+,Ag with the data below. Assume that γ± = 1 throughout. ...

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Figure 7.11 shows a Nernst graph drawn with the da...

Question: 7.17

A silver electrode is immersed into a dilute solution of silver nitrate, [AgNO3] = 10^−3 mol^−3. What is the electrode potential EAg^+,Ag at 298 K? Take E^OAg^+,Ag = 0.799 V. ...

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The Nernst equation, Equation (7.41), for the silv...

Question: 7.16

What is the activity coefficient of a solution of CuSO4 of concentration 10^−2 mol dm^−3? ...

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Again, we start by saying that I = 4 × c, so I = 4...

Question: 7.15

What is the activity coefficient of copper in a solution of copper sulphate of concentration 10^−4 mol dm^−3? ...

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Copper sulphate is a 2:2 electrolyte so, from Tabl...

Question: 7.14

Calculate the ionic strength of the 1:2 electrolyte CuCl2, again of concentration 0.01 mol dm^−3. ...

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Inserting charges in Equation (7.31):

I=\fr...

Question: 7.13

Calculate the ionic strength of the 2:2 electrolyte FeSO4 at a concentration c = 0.01 mol dm^−3. ...

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Inserting charges in Equation (7.31):

I=\fr...

Question: 7.12

Calculate the ionic strength of a simple 1:1 electrolyte, such as NaCl, that has a concentration of c = 0.01 mol dm^−3. ...

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Inserting values into Equation (7.31) we obtain [...

Question: 7.11

Hydrogen gas is mixed with a nitrogen ‘bath gas’. The overall pressure is p^O. If the mole fraction of the hydrogen is expressed as 10 per cent, what is its activity? ...

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By definition,

x_{({X})}=\mathrm{partial~pr...

Question: 7.10

A tooth filling is made of a silver amalgam that comprises 37 mol% silver. What is the activity of the mercury, a(Hg)? ...

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The activity of the mercury

a_{(\mathrm{Hg)...

Question: 7.8

The Clark cell Zn|Zn^2+, Hg2SO4|Hg is often employed as a standard cell since its emf is known exactly as a function of temperature. The cell emf is 1.423 V at 298 K and its temperature coefficient of voltage is −1.2 × 10^−4 VK^−1. What are ΔG(cell),ΔS(cell) and thence ΔH(cell) at 298 K? ...

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Before we commence, we note that the spontaneous c...

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