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Chemical formula: Si Synonyms: silicon metalloid Amount: aprox. 125 g (chunks vary in size but we attempt to provide each customer with 125 g of silicon) Appearance and odour: blueish, shiny lumps, without appreciable odour Grade: Electronics grade (‘chip grade’): ultra high purity Packaging: bubble wrapped, plastic zip lock bag Description and uses: Silicon metal (metalloid) is the prime semi-conductor metal for electronic applications. The electrical resistance of a 130 g chunk of this material on sale measured about 200,000 Ω (200 kilo ohm). By comparison, a similar sized block of crude aluminium measured less than 0.5 Ω. Dispatch: depending on time ...
Primary Standard for standardisation of acid titrant solutions. Twice recrystallised, anhydrous sodium carbonate of extraordinary purity. Chemical formula: Na2CO3 Appearance and odour: snow white amorphous powder, without appreciable odour Grade: 99.95 % (acidometric assay) Molar Mass: 105.9885 g/mole CAS: 497-19-8 Amount: 25 g Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labelled. Bottle and cap are UN approved and reusable. Description and uses: To prepare Primary Standard solutions for standardising acid titrant solutions. 250.0 ml of a 0.1 N (equivalent/L) sodium carbonate Standard Solution requires ...