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How do you make up 1.5 N Potassium Dichromate in 1 liter solution?
Jamesko321
- Dry potassium dichromate (standard certified quality, from NIST - SRM 136f or from another supplier), using a platinum dish or crucible. - Follow the mode of drying (generally 1 hour at 120 0C in an oven) indicated by the supplier. Place the potassium dichromate in an exsicator. - Prepare a volume of demineralized or distilled water - Weight 73,546 25 g potassium dichromate in a platinum dish calcined to a constant weight; apply a correction for the flotability of the air and the purity of the dichromate. Use a metrologically checked microbalance. - Place carefully the potassium dichromate in a 1 000 mL volumetric flask, dried and washed - Add about 900 mL water - Place the volumetric flask in a thermostat at 20 0C; after approx. 30 min add the water exactly to the mark. - Stirr the content of the volumetric flask; place a clear label on the flask (concentration, material, date of preparation, operator's name).
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