CHEM 1AL Lecture Notes - Lecture 3: Distilled Water, Barium Sulfate, Barium Chloride
18 Aug 2016
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Lab notes - gravimetric analysis of sulfate, week 1. Ashless filter paper wrapped in foil (11cm) Normal filter paper (11cm) for barium waste filtration towards the end of the lab: there are two different grades of filter paper in this experiment. There is whatman 42 ashless filter paper for collecting / igniting the sample, and another box of (cheaper) qualitative filter paper for waste purposes. Terry cloth gloves (or you can use tongs: these must be shared. Plastic droppers ph paper for barium waste treatment. For barium waste treatment: 0. 25m sodium sulfate, 1m sodium hydroxide. 10 (for big yellow hot plates: then turn down to below settings once thermometer reads 90c for each sample solution: Digest samples for at least one hour. If you cut digestion times too short, you risk growing crystals which are too small to be collected by subsequent filtration. Distilled water third tap at the lab sinks (taps are typically white).
