Download Analysis of Copper and its Alloys by W. T. Elwell PDF

By W. T. Elwell

ISBN-10: 0080121608

ISBN-13: 9780080121604

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Sample text

Wash down the inside of the beaker, re-fume the solution, then cool. Dilute to about 100 ml, boil the solution for 1 to 2 minutes to dissolve soluble salts (Note 7), then cool. Transfer the solution to a mercury-cathode cell, and electrolyse at 5 amp for about 1 hour, or until the electrolyte is colourless (Note 2). Rinse the cover-glass and inside of the beaker with water, and continue the electrolysis for a further 15 minutes. Remove the electrodes from the solution (wash the electrodes with water at the same time), and filter the solution, without delay, through a fluted N o .

REPRODUCIBILITY: 0Ό05 AT 0Ό4 PER CENT LEVEL NOTES. m. m. of bismuth. , use a larger sample-weight (2 to 10g), and proportionately more nitric acid (1 + 1). 2. 1. Special Procedure Reagents STANDARD BISMUTH SOLUTION. Dissolve 0 1 g of bismuth in 20 ml of cone, hydrochloric acid and 2 ml of cone, nitric acid, evaporate the solution to about 2ml, then cool. Dilute the solution to 100ml with hydrochloric acid (1+1). Dilute 10 ml of this solution to 1 litre. 1 ml = 0Ό1 mg of bismuth SODIUM DIETHYLDITHIOCARBAMATE SOLUTION (0-1 per cent).

Add 10 ml of the buffer solution, and boil the solution for 2 to 3 minutes. Add 10 drops of the P A N indicator, then titrate the hot solution with the standard zinc solution (0Ό5Μ) until the colour of the solution changes from green to violet. Add 30 ml of sodium fluoride solution (saturated), boil the solution for 2 to 3 minutes, add 5 drops of the P A N indicator, then titrate the hot solution with the standard zinc solution (0Ό5 M) until the violet colour is again produced. The volume of standard zinc solution added in the second titration is equivalent to the amount of aluminium present in the sample.

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Analysis of Copper and its Alloys by W. T. Elwell


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