56 per cent. of "potash and soda."
The relative proportions of the potash and soda can be ascertained from
the same determination. Sodium and potassium chlorides have the
following composition:--
Sodium 39.38 Potassium 52.46
Chlorine 60.62 Chlorine 47.54
----- -----
100.00 100.00
The percentage of chlorine in the mixed chlorides is calculated. It
necessarily falls somewhere between 47.5 and 60.6 per cent., and
approaches the one or the other of these numbers as the proportion of
the sodium or potassium preponderates. Each per cent. of chlorine in
excess of 47.5 represents 7.63 per cent. of sodium chloride in the mixed
chlorides. The percentage of potash and soda in the substance can be
calculated in the usual way. Sodium chloride multiplied by 0.5302 gives
its equivalent of soda (Na_{2}O), and potassium chloride multiplied by
0.6317 gives its equivalent of potash (K_{2}O).
The weight of sodium chloride in the mixed chlorides is also calculated
thus:--Take the same example for illustration. Multiply the chlorine
found by 2.103. This gives--
(0.0142?2.103) = 0.02987.
From the product deduct the weight of the mixed chlorides found--
Product 0.02987
Mixed chlorides 0.02660
-------
Difference 0.
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