Copper = 0.52%
---------------------------------------------
Cylinder VI. + Cu 10.5705
Cylinder VI. 10.0437
-------
0.5268
By colour, 100 c.c. = 0.0070}
0.0035} 0.0105
------ ------
0.0105 0.5373
Matte, No. 1070. Took 1.5 gram.
Copper = 35.82%
---------------------------------------------
Cylinder XIII. + Cu 12.0352
Cylinder XIII. 11.0405
-------
0.9947
By colour 100 c.c. = 0.0005}
0.0002} 0.0007
------ ------
0.0007 0.9954
X. Sample, Cake copper. Took 1.0053 gram.
Copper = 99.00%
---------------------------------------------
In the electrolytic assay of metals, alloys, precipitates, and other
bodies rich in copper, the preliminary separation of the copper by
sulphuretted hydrogen is unnecessary. It is sufficient to dissolve the
weighed sample in 10 c.
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