According to Garelli and Falciola, the depression in the freezing-point of
water caused by the saturation of that liquid with acetylene is 0.08 deg.
C., the corresponding figure for benzene in place of water being 1.40 deg.
C. These figures indicate that 100 parts by weight of water should dissolve
0.1118 part by weight of acetylene at 0 deg. C., and that 100 parts of
benzene should dissolve about 0.687 part of acetylene at 5 deg. C. In other
words, 100 volumes of water at the freezing-point should dissolve 95
volumes of acetylene, and 100 volumes of benzene dissolve some 653
volumes of the gas. The figure calculated for water in this way is lower
than that which might be expected from the direct determinations at other
temperatures already referred to; that for benzene may be compared with
Berthelot's value of 400 volumes at 18 deg. C. Other measurements of the
solubility of acetylene in water at 0 deg. C. have given the figure 0.1162
per cent. by weight.
TOXICITY.--Many experiments have been made to determine to what extent
acetylene exercises a toxic action on animals breathing air containing a
large proportion of it; but they have given somewhat inconclusive
results, owing probably to varying proportions of impurities in the
samples of acetylene used.
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