Stock Solutions 1. 20% TCA: (Merck 1.00807.1000) Fill up this bottle with Bidest (till the upper curvature of the Merck-bottle, about ~700 ml), solution process takes overnight. This solution is stable for months! This gives a “100%” solution; 100 ml + 400 ml Bidest = ~20% 2. 5% AgNO3: (Merck 1.01512.0100) Weigh in 5 g in 100 ml Bidest, fill in a brown bottle! Stable solution. 3. 1M NaOH: (Merck 6462.1000) Weigh in 4 g in 100 ml Bidest. 4. 0.5% Citric Acid: (Merck 1.00244.1000) Weigh in 50 mg in 10 ml Bidest, only 1 week stable! *
Chemicals Methanol, Ethanol, Acetic Acid, Ammonia (25%), Formaldehyd (37%) and Glycerol are from Merck.
Remarks * Prepare freshly! * Any brownish precipitate should immediately disappear, if not: the ammonia-solution is too old!
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