Analysis of Copper and its Alloys - download pdf or read online

By W. T. Elwell

ISBN-10: 0080121608

ISBN-13: 9780080121604

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Dilute the solution to about 100ml and add sulphuric acid ( 1 + 1 ) until the solution is just acid to litmus paper, then dilute to 1 litre. Dilute 50 ml of this solution to 250 ml. 1 ml 0Ό2 mg of arsenic AMMONIUM MOLYBDATE SOLUTION (1 per cent). To 60 ml of water add, slowly, 14ml of cone, sulphuric acid, then dissolve 1 g of ammonium molybdate in the warm solution. Cool and dilute the solution to 100 ml. This reagent must be freshly prepared. 2. Preparation of Calibration Graph. A d d , separately, 1-0, 2Ό, 3Ό, 4 0 and 5 Ό ml of the standard arsenic solution (1 ml = 0 O 2 m g As) to five 100-ml beakers each containing 1-Og of copper.

A d d ammonia solution until a permanent precipitate is just formed, re-dissolve the precipitate with a slight excess of hydrochloric acid ( 1 + 1 ) , then add 2 drops of the acid in excess. A d d about 60 ml of the E D T A solution ( 0 1 M) and heat the solution to boiling-point. A d d 2 g of ammonium acetate and 0-5 ml of the P A N indicator solution, then titrate the hot solution with the standard copper solution (0Ό5 M) until a deep-blue coloration is produced. Add 1 g of sodium fluoride, and boil the solution for 5 minutes.

Warm to dissolve the copper. A d d , separately, ΙΌ, 2 0 , 3Ό, 4 0 and 5 Ό ml of the standard bismuth solution (1 ml =0*1 m g Bi) to five o f the beakers; use the remaining solution as a blank. Proceed with each solution as follows : A d d ammonia solution until the precipitated cupric hydroxide just dissolves. A d d sulphuric acid ( 1 + 1 ) , dropwise, until the re-precipitated cupric hydroxide just re-dissolves, then add 5 ml of the acid in excess. Transfer the solution to a 100-ml calibrated flask, add 15 ml of potassium iodide solution (50 per cent) and 10 ml of sodium hypophosphite solution (25 per cent).

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

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