OF THE PARAFFINS AND THEIR MONOHALOGEN DERIVATIVES. 
29 
Table XV. 
p- 
V. 
pv. 
117-5 
64-8 
7613 
171-9 
44-2 
7597 
236-1 
32- 
7555 
370-5 
20-2 
7484 
Nearly saturated 
379-5 
19-6 
7438 
Part liquefied 
From these the correction factors were determined, the final results being shown in 
Table XVI. 
Table XVI. 
P- 
t. 
1 
V. 
!>■ 
Id (pv) 
p dv 
7- 
200 
12-4 
22-67 
48-30 
3-755 
1-017 
1-184 
205 
14-6 
22-70 
48-50 
3-787 
1-017 
1-188 
232 
15 
22-71 
48-56 
3-796 
1-020 
1-192 
225 
14-4 
22-60 
48-52 
3-809 
1-020 
1-187 
Mean . 
1-188 
It is assumed, in making these calculations, that small changes in the state of 
purity of the liquid do not appreciably alter the relative vapour densities, for one 
curve is used to give the correction term for all. 
§ 11. Propane. 
This gas was prepared by Schorlemmiir’s method of reducing isopropyl iodide 
with zinc and hydrochloric acid. The presence of free hydrogen in the gas is of no 
consequence, as it is removed by the liquefaction. 
The isopropyl iodide was made from glycerine, phosphorus, iodine, and water, using 
the proportions given by Beilstein. It boiled very constantly at 89°, showing that 
no considerable quantity of allyl iodide was present—any small quantity of this, 
however, would not interfere, for the propylene produced by its reduction would be 
removed by Nordhausen acid. 
To prepare propane from the isopropyl iodide, it was placed in a flask with granu¬ 
lated zinc and dilute hydrochloric acid. The issuing gas was first washed with 
water, and then passed through fuming sulphuric acid to remove the isopropyl iodide. 
Next it was passed through potash solution, and over 30 grams of palladium foil, to 
