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Paragraph 4 REAGENTS

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4.1

Diluted hydrochloric acid;

  • One volume of hydrochloric acid (ρ = 1.18 g/ml) plus one volume of water.

4.2

Sodium hydroxide solution, NaOH, 30% minimum (ρ = 1.33).

4.3

Hydrogen peroxide solution, 30% w/w.

4.4

Aqueous solution of barium chloride BaCl2.2H2O, 122 gram per litre.