By W. T. Elwell
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Extra info for Analysis of Copper and its Alloys
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).
Analysis of Copper and its Alloys by W. T. Elwell