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Paragraph 4 REAGENTS

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4.1

Nitrobenzene or diethyl ether.

4.2

Nitric acid, 10 M solution.

4.3

Indicator solution: dissolve 40 g of ferric ammonium sulfate [Fe2(SO4)3.(NH4)2SO4.24H2O] in water and make up to 1 litre.

4.4

Silver nitrate, 0.1 M solution.

4.5

Ammonium thiocyanate, 0.1 M solution.

  • Preparation: since this salt is hygroscopic and cannot be dried without risk of decomposition, it is advisable to weigh out approximately 9 g, dissolve in water and make up the volume to one litre. Standardise by titration against 0.1 M silver nitrate solution.

4.6

Potassium chloride solution: Dissolve 2.103 g of potassium chloride, previously dried at 130°C, for one hour, in water and make up to 500 ml.