Gravimetrical determination of silver in platinum concentrates in the Nietz Laboratory of Analytical Control

The photo shows one of the stages of the long-lasting gravimetrical determination of silver in platinum concentrates in the Nietz Laboratory of Analytical Control. During the neutralization reaction of ammonia with nitric acid silver chloride precipitates. The presence of an indicator in the solution gives beautiful pink colour, and the white “smoke” is volatile ammonium chloride..