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