Silber-Test: Echtheit selber prüfen & erkennen – Philognosie
3:03
Silber-Test: Echtheit selber prüfen & erkennen – Philognosie
Jul 23, 2020
philognosie.net
Tollen’s Test (Silver Mirror) Description: An aldehyde is oxidized by silver (I) to generate a carboxylic acid and silver metal, which coats the surface of the glass vessel. Materials: 0.1 M AgNO3 0.8 M KOH 0.5 M Dextrose Large test tube/rubber stopper Conc. HNO3 Beaker Conc. NH4OH Deionized water Procedure: This demonstration is best performed using a document camera. 1. Clean the test tube to be used by rinsing with concentrated nitric acid and washing well with hot water. 2. Prepare Tollen’s
2:08
Tollen’s Test (Silver Mirror) Description: An aldehyde is oxidized by silver (I) to generate a carboxylic acid and silver metal, which coats the surface of the glass vessel. Materials: 0.1 M AgNO3 0.8 M KOH 0.5 M Dextrose Large test tube/rubber stopper Conc. HNO3 Beaker Conc. NH4OH Deionized water Procedure: This demonstration is best performed using a document camera. 1. Clean the test tube to be used by rinsing with concentrated nitric acid and washing well with hot water. 2. Prepare Tollen’s
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