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Paragraph 4 REAGENTS

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4.1

Hydrochloric acid, 1 M solution.

4.2

Hydrochloric acid, 0.5 M solution.

4.3

Standard solution of magnesium, 1.00 mg per ml.

4.3.1

Dissolve 1.013 g of magnesium sulfate (MgSO4.7H2O) in 0.5 M in hydrochloric acid solution (4.2).

  • or:

4.3.2

Weigh out 1.658 g of magnesium oxide (MgO), previously ashed to removed all traces of carbonate. Place in a beaker with 100 ml of water and 120 ml of 1 M hydrochloric acid (4.1). When it has dissolved, transfer quantitatively into a 1 litre graduated flask. Make up to the volume and mix.

  • or:

4.3.3

Commercial standard solution.

  • The laboratory is responsible for testing such solutions.

4.4

Strontium chloride solution.

  • Dissolve 75 g of strontium chloride (SrCl26H2O) in the hydrochloric acid solution (4.2) and make up to 500 ml with the same acid solution.