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Edexcel | Chemistry WCH0 | S 16 5 1 | 1 hour 45 minutes
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20
(a)
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1 Mark

Manganese exists in different oxidation states which can be interconverted, using

suitable oxidizing and reducing agents.

  Use relevant standard electrode potential values, from page 17 of the Data Booklet,

to complete the table below in which two  values are missing.

 

 

20
(b)
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4 Mark s

The apparatus below is used to measure the standard electrode potential of

Identify, by name or formula, the substances needed in the salt bridge and the  

right-hand half-cell to measure the standard electrode potential. 

The measurement is made at 298 K and 1 atm.  State the other essential condition for 

solution C.

A  Salt bridge containing a solution of .............................................................................................................................................................................

B  Electrode made of  .........................................................................................................................................................................................................................

C  Solution containing  ......................................................................................................................................................................................................................

 Essential condition  ................................................................................................................................................................................................

 

IGNORE any temperature or pressure

20
(c) (I)
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2 Mark s

Manganate(VII) ions,can be made by oxidizing manganese(II) ions with

bismuthate(V) ions, , in acid solution.

   Use the information in (a) to write the overall ionic equation for this reaction.  

State symbols are not required.

 

20
(c) (II)
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1 Mark

 Hence calculate  for this reaction.  Include a sign and units in your answer.

 

20
(d)
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5 Mark s

ron(II) ions in solution are oxidized by the air to iron(III) ions.

  The amounts of iron(II) and iron(III) ions in solution can be found by using titrations 

with acidified potassium manganate(VII) which only reacts with the iron(II) ions.

portions of a solution A, containing a mixture of iron(II) and iron(III)

ions, were acidified and titrated with potassium manganate(VII) solution of

concentration 0.0195 mol

  • The mean titre was

  • About 150 cm of solution A was reacted with excess zinc, which reduced the

iron(III) ions to iron(II) ions.  The excess zinc was filtered off.

portions of this reduced solution, which contained iron(II) ions but no

iron(III) ions were acidified and titrated with potassium manganate(VII) solution

of concentration 0.0195 mol dm

The mean titre was 18.20 cm

Calculate the mass of iron(II) ions and the mass of iron(III) ions in 500 cm of the

original solution A.

 

 

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