Paragraph 4 REAGENTS
4.1
Diluted hydrochloric acid:
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One volume of hydrochloric acid (ρ = 1.18 g/ml) plus one volume of water.
4.2
1:10 dilute sulfuric acid:
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One volume of sulfuric acid (ρ = 1.84 g/ml) in ten volumes of water.
4.3
1:1 dilute ammonia solution:
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One volume of ammonia (ρ = 0.88 g/ml) and one volume of water.
4.4
Saturated solution of ammonium oxalate [(NH4)2 C2O4 H2O] at ambient temperature (approximately 40 g per litre).
4.5
Citric acid solution, 30% (m/v).
4.6
Ammonium chloride solution, 5% (m/v).
4.7
Solution of bromothymol blue in 95% ethanol, 0.1% (m/v).
4.8
Solution of bromocresol green in 95% ethanol, 0.04% (m/v).
4.9
Standard solution of potassium permanganate, 0.02 M.