WCH0 QR Dynamic Papers Chemistry al Edexcel

Edexcel | Chemistry WCH0 | W 19 5 1 | 1 hour 45 minutes

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(a) (I)

1 Mark

The reaction between iron(II) ions and manganate(VII) ions was investigated by

setting up a cell.

Solution A contains both iron(II) and iron(III) ions.

Identify the substance used for the electrodes.

X .............................................................................................

Y .............................................................................................

(a) (II)

2 Mark s

A student suggested that, for standard conditions, solution A should be

made by mixing equal volumes of 1 mol dm iron(II) sulfate solution and

1 mol dm iron(III) sulfate solution.

This mixture is not suitable for measuring the standard electrode potential of

this cell.

State how this mixture should be changed. Justify your answer.

(a) (III)

2 Mark s

Identify the compounds that may be used to make solution B

(a) (IV)

2 Mark s

A student suggested that the salt bridge could be made by soaking a strip of

filter paper in barium nitrate solution.

A reaction occurs when this salt bridge comes into contact with iron(II) sulfate

in solution A.

State what observation would be made and write the ionic equation for this

reaction. Include state symbols.

Observation:...........................................

(a) (V)

1 Mark

Suggest a more suitable compound to use when making the salt bridge.

(a) (VI)

1 Mark

Calculate for the cell. Use the data on page 17 of the Data Booklet.

(b) (I)

2 Mark s

A 3.00 g sample of powdered haematite contains iron(III) oxide, , as the

only iron compound. It was dissolved in dilute sulfuric acid forming a solution of

iron(III) sulfate.

THE(aq) was reduced to (aq) using a solution of sulfur dioxide

The resulting solution was made up to 250.0 cm The resulting solution was made up to 250.0 cm

25.00 cm portions of this solution were titrated with

0.0250 mol dm potassium manganate(VII) solution.

The mean titre was 24.50 cm

Explain why the solution of sulfur dioxide is suitable for reducing the iron(III) ionsUse the electrode potentials on page 15 of the Data Booklet.

(b) (II)

4 Mark s

Calculate the percentage, by mass, of iron(III) oxide in this sample of

haematite.

(b) (III)

2 Mark s

Iron(II) sulfate can be oxidised by dichromate(VI) ions in acid conditions.

Use the half equations for the oxidation of iron(II) ions and the reduction of

dichromate(VI) ions to write the overall ionic equation for the reaction.

State symbols are not required.

(b) (IV)

1 Mark

Suggest a practical reason why potassium manganate(VII) is preferred to

potassium dichromate(VI) for use in titrations with iron(II) sulfate.

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