| of the Slag.
----------+----------------+-----------+--------------
Lead. | Copper. | Lead. | Copper.
6.8 | 93.2 | 71.4 | 21.4
20.0 | 80.0 | 78.0 | 17.0
28.0 | 72.0 | 80.0 | 12.5
32.0 | 68.0 | 86.0 | 6.7
85.0 | 15.0 | 90.0 | 3.6
----------+----------------+-----------+--------------
It will be seen from this table that the slag is always much richer in
lead and poorer in copper than the metal with which it is in contact.
The ratio of lead to copper in these five samples is:--
In the Metal. In the Slag.
1 : 14 1 : 0.3
1 : 4 1 : 0.2
1 : 2.5 1 : 0.16
1 : 2 1 : 0.08
1 : 0.16 1 : 0.04
Assuming these figures to be correct, the following statement is
approximately true. On oxidising an alloy of 10 grams of copper and 10
grams of lead, and pouring off the slag when 3 grams of lead have gone
into it, there will be a loss of (owing to the slag carrying it off)
about 0.2 gram of copper. On repeating the operation, the next 3 grams
of lead will carry with them about 0.5 gram of copper; and on again
repeating, 3 grams of lead will remove 0.
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